BACKGROUND

[0001] This invention relates to an unstable workout surface with a flexible design and designed to be more ergonomic and more effective at building strength, balance, flexibility and core stability simultaneously

[0002] Several devices are marketed for exercise therapy, strength conditioning or physical training. Of these devices, the unstable surface workout products do not offer levels of difficulty for different fitness levels. These devices are not ergonomically designed, thus making them

unapproachable for at-risk populations that need to exercise more. These devices also increase the risk of injury in healthy populations. Also, these devices are often large and difficult to store, especially during travel.

[0003] U.S. Pat. No. 7,344,488 and U.S. Pat. No. 7,494,446 describe a balancing device known as the BOSU Ball. The balancing device has a base and an inflatable flexible portion wherein the center of the inflatable portion is higher than the edges. The device is used by placing the base on the floor and standing and moving on the bladder. The patent also describes an elastic handle being affixed to the base of the device. The largest problem/shortcoming with the BOSU Ball are that BOSU Ball’s are large and difficult to store, travel with, or set-up for home use, and do not permit level of difficultly adjustments for different fitness populations as a standalone device. [0004] U.S. Pat. No. 7,806,807 describes an exercise device for improving balance, comprising a platform; a balancing element mounted to the platform so as to permit angular displacement of the balancing element relative to the platform; an adjustable angular displacement

limiter for determining a limit of the angular displacement of the balancing element relative to the platform; and an adjustment access path to provide adjustment access to the limiter while the balancing element is operably mounted to the platform. The largest problem/shortcoming of this “wobbler” device is that it is not a multi-purpose workout device, and, therefore, does not allow for a full-body workout. Additionally, this device is designed to be used for specific populations with joint instability or other lower body physical rehabilitation, so the workout difficult is low and not suitable for more physically fit users. [0005] U.S. Pat. No. 9,095,738 describes a combination balance and stability training and resistance training exercise device, comprising a platform and a balance element. The exercise device can also comprise one or more resilient, elongate resistance training elements for resistance training. The exercise device can be provided with a stabilizing device. When removed from the stabilizing device, the exercise device can be used in a manner similar to a

conventional balance board. When mounted on the stabilizing device, the exercise device is supported in a stable orientation for performing exercises requiring a stable and balanced support surface.

[0006] Accordingly, there is an unmet need for a portable total body fitness product specifically built for rehab, youth, elderly, and recreationally active populations to have the ability to work out safely, effectively, and creatively while also being small enough for use as a home gym during travel.

SUMMARY

[0007] The invention is multi-faceted

[0008] An embodiment of the invention is for promoting balance. The device is a light-weight, half sphere-like structure that is approximately 12 inches diameter and weighs between 4 and 12 lbs. The device has a flat circular base made of a hard material to provide a stable surface that is 12 inches in diameter to keep the bottom of the device in contact with a planar surface, such as a floor. The device also has a semi-flexible portion positioned on the top of the base. At rest, the flexible portion is a half-sphere in shape and is substantiated with a material that can support weight-lifting activities. The flexible portion is structured and arranged such that if it is compressed at a point adjacent but not at the center, the flexible portion exerts a force having a component away from the center of the flexible portion which tends to cause person to be displaced unless the person exercised sufficient balance to resist the outside force.

[0009] The semi-flexible portion is a bladder comprising a fluid, gas, foam, or gel encased in a hard material comprising polyvinyl chloride, rubber, or other dense polymer material. Preferably, the top of the bladder is convex with respect to, and generally circular when viewed from, a point above the device.

It is also preferable for the bladder to be anchored to the base points radially from the longitudinal axis of the device, where the bladder defines a longitudinal axis generally perpendicular to the planar surface. The anchored points may be below the center of the top of the bladder. The majority of the points along the top of the bladder between the center and the anchored points, as the radial distance from the longitudinal axis increases so does the axial distance from the top center point of the bladder.

[0010] Another embodiment of the invention also provides a device for promoting balance. In this embodiment, the device has an semi -flexible bladder defining a longitudinal axis extending through a portion of the center of the bladder. The top portion of the bladder defines the outer upper portion of the bladder while the bottom portion of the bladder defines the inner lower portion of the bladder. The upper and lower portion of the bladder meet at the outer radial edges. The outer radial edges of the bladder are connected to the base and anchored to the base. The anchored points may be below the center of the top and the center of the bottom portion of the bladder. Between the center of the bottom portion of the bladder and the planer surface is a cavity. The upper surface of the bladder is structured and arranged so that the highest point of the bladder is at a point between the outer edges, and a user standing on the device has to exercise balance to remain on it.

[0011] It is generally desirable for the device to be generally circular about the longitudinal axis and the base generally cylindrical. It is also desirable for the base to be concave along the longitudinal axis when viewed from a point below the base, and to maintain at least three points of contact with a generally planer surface such as a floor. The majority of the points along the bottom of the bladder between the center point and the anchored points at base, as the radial distance from the longitudinal axis increases so does the axial distance from the center point of the bottom of the bladder so as to appear concave when viewed from a point below the base.

[0012] Preferably, the device has a plurality of generally annular ridges disposed on the upper surface of the bladder that circumferetially extend around the longitudinal axis.

[0013] In another embodiment of the device, the bladder is to have a hole extending through the bottom surface and connecting the chamber to atmosphere. A removable plug is used to close the bladder hole. In such an instance, the base also has a hole extending from the bottom of the base to the top of the base, the base hole being adjacent to the bladder hole. Preferably, the portion of the bottom surface of the bladder hole has a truncated cone shape that extends downwardly into the base hole. [0014] In another embodiment of the device, a device for promoting balance has a longitudinal axis and includes: an semi-flexible bladder having a top and a bottom surface that define a chamber and are joined at edges positioned a radial distance from the longitudinal axis; a rigid base having a top surface, bottom surface and outer edges, the bottom surface intended for placement on a planar surface, and the top surface of the rigid base opposing the bottom surface of the bladder; a clamp circumferentially extending around at least a portion of the base; and a groove defined by the clamp and the base to secure the bladder edges to the base.

[0015] Desirably, the outer edges of the bladder define a generally planar circle extending circumferentially around the longitudinal axis.

[0016] Optionally, the outer edges comprise a rim meeting one or more of the following conditions: a portion of the rim is below at least a portion of the bottom surface of the bladder; the outermost point of the rim is beyond the outermost point of the bladder surface; the bottom of the surface and the top of the surface of the bladder meet at a point near the top of the rim and the radial width of the bottom edge of the rim is greater than the radial width of the bladder at that point; the width at the top of the groove is less than the width of the rim and the rim is disposed in the groove; the rim has a flange extending upwardly from the top, outer edge of the rim; the rim has a flange extending inwardly from the bottom half of the inner edge of the rim; and the rim has a chamber in communication with the chamber of the bladder whereby increasing pressure within the rim chamber increases the size of the rim.

[0017] It is preferable for the clamp to have a side and a top extending inwardly from the side, so that the groove is at least partially defined by the side of the clamp and portion of the base. Thus, the groove may further have a bottom and an inner side that are defined by the base. A portion of the base may also extend from the inner side and outwardly over the groove and the top of the clamp may extend inwardly over the groove. [0018] In a further refinement of the forgoing embodiment, the other edges comprise a rim, the rim comprises a first flange extending upwardly from the top and outer edge of the rim and below the portion of the clamp extending inwardly from the bottom half of the inner edge of the rim and below the portion of the base extending outwardly over the groove.

[0019] It is desirable for the dimensions of the groove to be sufficient to secure the bladder edges to the base wherein if the clamp is removed from the base, the bladder will not remain secured to the base during use.

[0020] The clamp may also include a number of optional features. For example, it may have a rounded ridge extending upwardly from the top, inner-most edge of the clamp. It may also be made of polypropylene, no-break polypropylene or high-density polyethylene. The clamp may also comprise a plurality of separate clamp portions whereby each portion extends less than the entire circumference of the base. Even so, all of the clamp portions collectively may extend around the entire circumference of the base. The clamp portions may be removably affixed to one another by a screw or similar fastener. The clamp portions may also be removably affixed to one another by use of a lap joint. The radial thickness of the clamp may be greater at the lap joint than at the remainder of the clamp, such that the thickness of a clamp portion at the lap joint is approximately equivalent to the thickness of the remainder of the clamp portion.

[0021] A further embodiment of the present invention provides a method of manufacturing a device for promoting balance. The steps include: placing an semi-flexible bladder on a base; placing a first clamp along the outer edges of a circumferential portion of the base in an abutting relationship with a portion of the outer edges of the semi-bladder; placing a second clamp along the outer edges of another circumferential portion of the base in an abutting relationship with another portion of the outer edges of the inflatable bladder; securing the first clamp to the second clamp and thusly securing the outer edges of the bladder into a circumferential groove defined by the clamps and the base.

[0022] In the foregoing method, the first clamp may be removably secured to the second clamp and the method further includes: detaching the first clamp from the second clamp; replacing the bladder with another bladder; and securing the first clamp to the second clamp and thusly securing the outer edges of the other bladder. Preferably, the first clamp and the second clamp collectively extend around a majority, or the entire length, of the outer edges of the base. The clamps may be placed along the outer edges of the base primarily by movement in a direction transverse to the longitudinal axis of the device.

[0023] In still another embodiment of the present invention, a method of using a device for promoting balance comprises: providing a device having a semi-flexible bladder and a base, whereby the center of the top of the bladder is higher than the remainder of the bladder and the bladder is above and secured to the base; placing the bottom of the base on a planar surface such that the center of the top of the bladder is above the base and the planar surface; and standing or moving on the top of the bladder. Balance is promoted when the bladder tends to direct the user in a direction away from the center of the bladder. By way of example, the step of standing or moving on the top of the bladder may comprise repeated jumping on bladder.

[0024] The foregoing device can be made from a variety of materials. For instance, the bladder may be a burst-resistant vinyl, PVC or an elastomeric resin. The hardness of the bladder can reflect the intended use of the device. The bladder may also use a foaming agent.

[0025] Preferably, the upper and lower surfaces of the bladder are formed of a single, integral material by the process of rotational molding. It is also desirable for the bladder material thickness to be thicker at the center of the upper surface when than at the edges. The material thickness at the rim may also be greater than the average material thickness of the bladder.

[0026] The base also includes two handles. The handles are disposed on opposite sides of the base and comprise concave indents with holes through each side of the base and are accessible from the base bottom.

[0027] The indented handles are defined on both the top and bottom side by an inner wall and an outer wall. The outer wall forms an arc extending from a space near the top of the inner wall, upwards to a point wherein it forms a cylindrical hole through the base and then down to the base bottom. The wall is not only an arc in the radial direction, but also an arc in the circumferential direction as well. Thus, the handles have the shape of a portion of sphere. The indentions should be large enough to let a person grip and move the device and the holes should be large enough to permit the attachment of a removably attachable component.

[0028] An additional embodiment of the present invention comprises attachable component pieces, wherein the attachable component pieces have a means of attaching removably to the base of the device. An attachable component is selected from the group consisting of a rubber power bands, ankle straps, and push-up bars.

[0029] Preferably, the component pieces removably attach to the device by a means wherin they are attached to one or both handles dispersed on opposite sides of the of the base. [0030] The forgoing device has a means by which to attach an overall power band assembly to the base of the device; the overall power band assembly comprising two small removable power bands connected to a large rubber power band. The large rubber power band has a top and a bottom end. The top and bottom end are opposite of each other in the longitudinal direction. The top end is attached to a handle with a grip. The bottom end is connected to one end of each short power band so that the overall power band assembly resembles an upside down letter Y. The opposing end of each short power band is connected to a means of attachment to the base of the device. The means of attachment is selected from the group consisting of a hook, a carabiner, a buckle, or other general means of attachment.

[0031] An additional embodiment of the device has a means by which to attach a removable adjustable ankle strap to the base of the device. The ankle strap has a top and a bottom end. The top and bottom end are opposite of each other. The top end is connected to a means of attachment to the base of the device. The bottom end is also connected to an identical means of attachment to the base of the device. The means of attachment is selected from the group consisting of a hook, a carabiner, a buckle, or other general means of attachment. [0032] An additional embodiment of the device has a means by which to attach a removable push-up bar to the base of the device. The push up bar has a top and a bottom end. The top and bottom end are opposite of each other. The push up bar is curved as to resemble half of a circle. A handle with a grip is attached to the middle of the curved push up bar halfway along the length of the bar between the top and the bottom end. The top end is connected to a means of attachment to the base of the device. The bottom end is also connected to an identical means of attachment to the base of the device. The means of attachment is selected from the group consisting of a hook, a carabiner, a buckle, or other general means of attachment.

[0033] Yet another embodiment of the present invention includes the ability to connect two separate half-spheres via a locking mechanism to form a complete sphere. When locked together, a compartment is formed from the concave cavities of the individual half-sphere devices. The compartment serves as a storage space for component pieces in the forgoing embodiments.

[0034] In another embodiment of the device, a removable disc can be attached to the bottom of the base to form a planar surface. When the removable disc is attached to the device, it is desirable for the base to be flat along the longitudinal axis when viewed from a point below the base, and to maintain between three and twelve points of contact with a generally planer surface such as a floor.

[0035] An embodiment of the forgoing device in which the points of contact with a generally planer surface such as a floor is maintained via twelve interlocking feet attached to the different points of base of the device near the outer edge of the base. The outer edge of the base is defined by an inner circumference side closer to the longitudinal axis and an outer circumference side further away from the longitudinal axis. Each foot has a top surface, a bottom surface, a 45 degree angle side, a 90 degree angle side, two radial facing sides, and two chamfered edges. The bottom surface of each foot is larger in surface area than the top surface and is intended to maintain contact with the generally planar surface. The top surface of each foot is connected to the bottom surface of the base. The top surface and bottom surface are connected by the 45 degree angle side, the 90 degree angle side, and the two radial facing sides. Each radial facing side is connected to the 45 degree angle side by the chamfered edges. Each radial facing side is connected directly to the 90 degree angle side.

Six of the feet are attached to the outer circumference side of the outer edge of base of the device so that they are connected to the bottom surface of the base of the device and are positioned at intervals of 60 degree angles from each other along the longitudinal axis. Each 45 degree angle side of the six feet along the outer circumference side of the base is facing towards the longitudinal axis while the 90 degree angle side is facing away from the longitudinal axis. Six of the feet are attached to the inner circumference side of the outer edge of the base of the device so that they are connected to the bottom surface of the base of the device and are positioned at intervals of 60 degree angles from each other along the longitudinal axis. Each 45 degree angle side of the six feet along the inner circumference of the base is facing away from the longitudinal axis while the 90 degree angle side is facing towards the longitudinal axis. Each foot attached to the inner circumference side and each foot attached to the outer circumference side are equally spaced from each other at intervals of 30 degree angles from each other along the longitudinal axis.

[0036] A further embodiment of the forgoing device featuring an interlocking system for reversibly connecting two identical devices comprising a system encompassing any one or more combinations of the elements described in U.S. Pat. No. 5,530,998, U.S. Pat. No. 3,217,746, U.S. Pat. No. 4,366,866, U.S. Pat. No. 4,595,251, U.S. Pat. No. 3,145,870, U.S. Pat. No. 2,867,025, and U.S. Pat. No. 1,493,365.

[0037] An interlock system for reversibly connecting two identical devices comprising: a first device comprising a base having an outside edge, an inside edge, a top surface, and a bottom surface; a second device comprising a base having an outside edge, an inside edge, a top surface, and a bottom surface; a first elongated, flexible member comprising a bottom surface, a back surface, two straight side surfaces, and two chamfered edges separated by an angled surface, and a top surface, wherein the top surface is connected to the outside edge of the bottom surface of the base of the first device; a second, elongated, flexible member comprising a bottom surface, a back surface, two straight sides surfaces, and two chamfered edges separated by an angled surface, and a top surface, wherein the top surface is connected to the inside edge of the base of the second device. The interlock system described above, wherein the base of the first device and the second device is circular. The interlock system of any one of the descriptions above, wherein the total number of elongated, flexible members range from 2 to 24. The system comprises a method of connecting two identical devices, the method comprising: aligning a first device with a second device along a common longitudinal axis, wherein each device comprises an identical interlocking component; joining the interlocking component of the first device with the interlocking component of the second device; rotating the first and second devices in opposite directions along the longitudinal axis until the interlocking components are engaged.

[0038] A further embodiment of the forgoing device in which each foot serves as a component of an interlocking mechanism to connect two separate half-spheres to form a complete sphere. The interlocking mechanism in which two devices are locked together to form a whole sphere is actuated by aligning the bases of two devices and rotating each device along its longitudinal axis in opposite directions. Grooves along the inner circumference side and outer circumference side of the base help guide rotation to make assembly easier while additional grooves along the inner circumference side and outer circumference side of the base push the two units apart and keep the foot pads from rubbing on anything. The 45 degree angle sides of the feet pull the two units together. The chamfered edges to help prevent binding.

[0039] A further embodiment of the forgoing device where the bottom surface of each foot is attached to a non slip pad selected from a group consisting of a foam, a gel encased in a hard material comprising polyvinyl chloride, rubber, and other dense polymer material. Foot pads have extra clearance on bottoms for any debris that might get stuck to the feet prior to assembly of the complete sphere. No rubber sliding against other parts during assembly of complete sphere.

[0040] An additional embodiment of the forgoing device in which the points of contact with a generally planer surface such as a floor is maintained via three cylindrical feet attached to the different points of base of the device near outer edge of the base. Each cylindrical foot has a top surface, bottom surface, and a side. The bottom surface of each foot is intended to maintain contact with the generally planar surface. The top surface is connected to the bottom surface of the base of the device by a rigid narrow cylinder. Each foot and rigid narrow cylindrical connector are positioned on the outer circumference of the base of the device from each other so that they are connected to the bottom surface of the base of the device and are positioned at intervals between 30 and 120 degree angles from each other along the longitudinal axis.

[0041] A further embodiment of the forgoing device in which the cylindrical foot and rigid cylindrical connector serve as the male component of an interlocking mechanism. [0042] An additional embodiment of the forgoing device in which three separate identical keyhole cavities are positioned on the outer circumference of the base of the device from each other so that they are indented into the bottom surface of the base of the device at 120 degree angles from each other along the longitudinal axis. The keyhole cavities serve as the female component of the forgoing interlocking mechanism. [0043] An additional embodiment of the invention in which two devices are locked together to form a whole sphere by inserting the male ends of interlocking mechanisms into the female ends of the interlocking mechanisms and rotating each device along its longitudinal axis in opposite directions.

[0044] A method of use in which the user places two devices adjacent to each other, wherein the outside base edge of one of the devices is approximately 1 inch to 36 inches away from the nearest outside base edge of the second device. While standing, the user then places one foot on the first device and follows by placing his or her second foot on the second device until the user is standing by simultaneously by having the sole of one foot in contact with the top of the first device and the sole of the other foot in contact with the top of the second device. The forgoing feet may be bare or each covered by a shoe.

[0045] Another embodiment of the forgoing method in which the two devices or rotated on their axial axis by 180 degrees so that the base, which is fitted with the flat removable disc, is facing upright and the top is in contact with a planar surface, such as the floor. The outside base edge of one of the devices is approximately 1 inch to 36 inches away from the nearest outside base edge of the second device. While standing, the user then places one foot on the first device and follows by placing his or her second foot on the second device until the user is standing by simultaneously by having the sole of one foot in contact with the upright base fitted with the flat removable disc of the first device and the sole of the other foot in contact with the upright base fitted with the flat removable disc of the second device. The forgoing feet may be bare or each covered by a shoe.

BRIEF DISCRETION OF THE DRAWINGS

[0046] FIG. l is a plan view of a device in accordance with the invention [0047] FIG. 2 is a cross-sectional view, with a dot-dash circle, of semi-flexible portion of the device along line II-II of FIG. 3

[0048] FIG. 3 is a plan view of the device from the top of the device

[0049] FIG. 4 is a perspective view from the bottom of the device with removable base cover in position. [0050] FIG. 5 is a perspective view of the bottom of the removable base cover.

[0051] FIG. 6 is a perspective view of a portion of the removable base cover joining with the base of the device

[0052] FIG. 7 is a perspective view of the bottom of the base [0053] FIG. 8 is a perspective view of the interlock system [0054] FIG. 9 is a schematic diagram of a method of use for device 10 [0055] FIG. 10 is a schematic diagram of the method of use for the interlock system 200

DETAILED DESCRIPTION

[0056] FIG. 1 illustrates one embodiment of a device 10 for promoting balance in individuals. Device 10 includes a semi-flexible portion 50 and a base 100.

[0057] Preferably, the device is generally hemispherical about a longitudinal axis 20 as shown in FIG. 1. Directions are stated in this disclosure with reference to the longitudinal axis 20. Thus, the terms“axial” and“axially” should be understood as referring to the directions parallel to longitudinal axis 20.“Upward” and“above” refer to one axial direction and“downward” and “below” refer to the opposite axial direction, such that the“top” portion of a component is spaced above a“bottom” portion. The terms“radial” and“radially” should be understood as referring to the directions transverse or perpendicular to this axis. The term inward” refers to radial directions towards the axis, whereas“outwardly” refers to radial directions away from the axis.

“Circumferential” directions refer to directions around the longitudinal axis indicated by the arrow 21. The device is generally circular when viewed from above.

[0058] Although it should be understood that the actual dimensions of the device's components are not essential to the invention, certain dimensions are provided for illustrative purposes. For example, the device is particularly suited for use by a single adult when the radial distance from longitudinal axis 20 to the outer edge of bladder top 50 is about 8" and 15". However, the dimensions could increase or decrease depending on the intended uses. Other references to dimensions herein shall be made on the assumption that the device is about 12" wide.

[0059] The round semi-flexible portion may be formed out of a bladder 50. Such a bladder is shown in more detail in FIG. 2. The top 60 of bladder 50 is generally hemispherical or bowl-shaped such that radial center 51 of bladder top 60 is disposed above the bladder top's outer edges 52. In other words, the upper surface of the semi-flexible portion 50 is generally concave with respect to the base such that the radial distance from longitudinal axis 20 to the upper surface of the bladder increases as the axial distance from center 51 (e.g., the point where the top of the bladder meets longitudinal axis 20) increases downwardly. [0060] A number of annular ridges 55 are disposed on top of bladder top 50. The annular ridges extend in the circumferential direction and are radially spaced from one another such that they form concentric circles around the top of the device. The ridges should be large enough to aid the grip of a person standing or moving on the bladder (hereafter, a“user”). On the other hand, the ridges should not be so large that they are uncomfortable to the user. The ridges may be about 0.030" high and spaced about 1.4" apart from one another when the bladder partially inflated, which results in about 4 ridges being present on a 12" wide bladder.

[0061] The top 60 of bladder 50 is generally hemispherical and so is the bottom 62, generally.

The bladder bottom 62 may include a hole that allows air to travel between the outside of the bladder and the chamber 65 defined by the top 60 and bottom 62 of the bladder 50. A hole, if present, preferably resides along the longitudinal axis 20 near the top center 51.

[0062] Surrounding the hole is a raised portion. Raised portion extends upwardly from bladder top 60 and away from chamber. The radial width of the raised portion varies such that the raised portion is widest immediately adjacent the bladder top and is most narrow at the axial distance furthest from the top. In other words, the radial distance decreases as the raised portion extends further away from the bladder top. Preferably, even the most narrow portion of the raised portion has a radial distance greater than the radius of hole. Thus, the raised portion has a hollow- truncated cone shape with the base of the cone connected to bladder top.

[0063] The axial distance from the bladder top to the bottom of the raised portion may be about 0.4". At its widest, the raised portion may be about 1 " and at its most narrow may be about 0.75".

The diameter of the hole may be about 0.25".

[0064] Because of the elastomeric nature of bladder 50, the volume of inner chamber 65 is proportional to the amount of air pressure or fluid or gel or foam within the chamber.

[0065] As shown in Fig. 2, the bottom 62 of bladder 50 meets the top 62 at the outer edges of the bladder 54. The top and bottom meet at both a constant radial and axial distance, such that the top and bottom meet at an edge which forms a planer circle extending circumferentially around the longitudinal axis 20.

[0066] The top surface 101 of the base 100 connects the top 60 to the bottom 62. The top surface of the base 101 extends circumferentially around the outer edges of the bladder top 52 and connects to the bladder bottom 62 at the outer edges of the bladder 54. The outer edge 102 of the base top surface 101 radially extends beyond the outer edge of bladder top 52. The inner edge 103 of base top surface 101 radially extends beyond the inner edge of bladder bottom 62. The top surface of the base 101 is generally flat, with the exception of a recessed cavity 105 which is parallel to the longitudinal axis 20 and extends downward for about 0.1 inches into the base 100 and extends circumferentially around the top surface of the base 101 at a constant radius from the longitudinal axis 20. The bottom surface of the base 110 is defined by a recessed compartment that is parallel to the longitudinal axis 20 and extends circumferentially around the base 100 and defined by an inner rim wall flange 130 and an outer rim wall flange 120.

[0067] As shown in FIG. 4, the bottom surface of the base 110 includes up to two flanges 120 and 130. Specifically, outer wall rim flange 120 may extend about 1 inch downwardly from the top outer edge 102 of the base 100. The inside rim flange 130 may extend about 1 inch downwardly from the inner edge 103 of the base 100. An inner wall rim flange rounded ridge 121 and an outer wall rim flange rounded ridge 131 may extend about 0.05 inches beyond the bottom of each flange 120 and 130 and extend circumferentially around the base 100. These flanges are helpful for serving as attachment points for the feet 201 and 202 of the device as well as the components of the interlock system which will be described in more detail below. The ridges 121 and 131 are helpful in guidance and function of the interlock system.

[0068] The total radial width of the base 100 may be about 1.5" and the radial width may be about 0.25". The outer rim flange 120 may extend about 1 " below the top outer edge 102 and inner rim flange 130 may extend about 1" below from the inner edge 103. The axial distance of the gap between inner rim flange 130 and the outer rim flange 120 may be about 1.25". The distance from the top surface of the bottom of the base 119 and the top surface of the base 101 may be about 0.5".

[0069] Preferably, the bladder is made out of a burst-resistant vinyl such as PVC or another plastisol or elastomeric resin or foam. The hardness of the bladder material should reflect the intended use of the device 10. For example, if device is primarily intended for outside use, a harder and more durable resin may be desirable. Heavier athletes may also need a more durable material. On the other hand, if the device is intended for inside use, a softer and more flexible resin may also be appropriate. A foaming agent may also be added to the material. Sand or the like may also be incorporated into the material to prevent slippage. [0070] It is also desirable for the entire bladder to formed from a single, integral material. The bladder may be formed by the process of rotational molding. Preferably, the mold is kept hotter at the top center 51 (FIG. 2) to draw more material to that area and thus increase the thickness. The average thickness of the bladder may be up to 1.5 inches.

[0071] The base 100 is generally cylindrical. As shown in FIG. 7 (which omits other components of the device for clarity), the bottom 110 of the base 100 radially extends from an inner base point

111 near the longitudinal axis 20 to an outer base point 113. The radial distance between outer base point 113 and longitudinal axis may be about 6". The axial distance between the outer base point 113 and the inner base 111 point may be about 1.5".

[0072] The inner outside wall 112 extends upwards from outer base point 113 of the outer rim flange 120. The outer foot flanges 205 are disposed at the top and sides of inner outside wall

112 and extend a short distance radially inwardly from the top of the wall 112. Up to six outer foot flanges 205 can be connected to the inner outside wall 112. For each outer foot flange 205, a lip 211 also extends radially inwardly from inner outside wall 112. The lip 211 extends further out than flange 205 and is disposed at an axial distance below the flange 205. Thus, each flange 205 extends like a hook over each lip 211. The bottom surface 220 of each lip 211 is in covered by a non-slip coating 240 as shown in FIG. 8. The flange 205, the lip 211, the bottom surface, 220, and the non slip coating 240, encompass an outside foot 201 when considered together. The axial height of the outside inner wall 112 may be about 0.55" to 1.1". The radial width of the flange 205 may be about 0.1" to 0.2". The radial width of each lip 211 may be about 0.5" to 1".

[0073] The outer inside wall 114 extends upwards from inner base point 111 of the inside rim flange 130. The inner foot flanges 206 are disposed at the top and sides of outer inside wall 114 and extend a short distance radially inwardly from the top of the wall 114. Up to six inner foot flanges 206 can be connected to the outer inside wall 114. For each inner foot flange 206, a lip 212 also extends radially outwardly from outer inside wall 114. The lip 212 extends further out than flange 206 and is disposed at an axial distance below the flange 206. Thus, each flange 206 extends like a hook over each lip 212. The bottom surface 221 of each lip 212 is in covered by a non-slip coating 240 as shown in FIG. 8. The flange 206, the lip 212, the bottom surface, 221, and the non-slip coating 240, encompass an inside foot 202 when considered together. The axial height of the outer inside wall 114 may be about 0.55" to 1.1". The radial width of the flange 206 may be about 0.1" to 0.2". The radial width of each lip 211 may be about 0.5" to 1". [0074] The center of the base is open hole defined by inner base point 111. Returning to FIG 2, an interior wall 300 extends radially outwardly from the top 305 of the bottom surface 301 of the device, and from there the wall 301 extends radially outwardly and axially downwardly to the base bottom 103. The open hole defined by base point 111, the interior wall 300, and the removable bottom cover 400 when attached define a chamber 140.

[0075] It should be understood that the structures discussed in connection with Fig. 7 also extend in the circumferential direction about the longitudinal axis 20. Thus, although the outer base point 113 is described as a“point”, the outer base point 113 is actually a ring which circumferentially extends around the longitudinal axis 20. Likewise, chamber [0076] A non-skid surface 240 is appended to the bottom of each foot 201 and 202. The surface

240 is made of a somewhat sticky material such as thermoplastic rubber which helps the feet 201 and 202 grip the floor surface while the device is in use. The non-skid surface 240 is appended to the feet 201 and 202 using the process of over-molding. The non-skid surface is preferably about 0.06" thick. [0077] As shown in FIG. 3, the base 100 also includes two handles 150. The handles are disposed on opposite sides of the base along the II-II plane and comprise concave indents which form holes through each side of the base and are accessible from the base top and base bottom.

[0078] The indented handles 150 are defined on both the top and bottom side by an inner wall and an outer wall. The outer wall forms an arc extending from a space near the top of the inner wall, upwards to a point wherein it forms a cylindrical hole 0.05" to 0.75", and preferably 0.2" in diameter, and then down to the base bottom. The wall is not only an arc in the radial direction, but also an arc in the circumferential direction as well. Thus, the handles 150 have the shape of a portion of sphere. The holes should be large enough to let a person grip and move the device and permit the attachment of a removably attachable component. [0079] As shown in FIG. 8, an interlock system for reversibly connecting two identical circular devices comprising: a first device comprising a base having an outside edge, an inside edge, a top surface, and a bottom surface; a second device comprising a base having an outside edge, an inside edge, a top surface, and a bottom surface; a first elongated, flexible member flange 205 and lip 211 comprising a bottom surface 220, a back surface 222, two straight side surfaces 223, and two chamfered edges 224 separated by an angled surface 225, and a top surface 226, wherein the top surface 226 is connected to the outside edge 120 of the bottom surface 110 of the base 100 of the first device; a second, elongated, flexible member flange 206 and lip 212 comprising a bottom surface 221, a back surface 227, two straight sides surfaces 228, and two chamfered edges 229 separated by an angled surface 230, and a top surface 231, wherein the top surface 231 is connected to the inside edge 130 of the base 100 of the second device.

[0080] As shown in FIG. 10, the interlocking system wherein the base of the first device 1 and the second device 2 is circular with the center of each device being defined as the longitudinal axis 20 perpendicular to the planar surface. The interlocking system wherein 1 to 12, preferably 6, elongated flexible members are connected to the outside edge of the bottom surface of the base of the first device. The interlocking system wherein 1 to 12, preferably 6, elongated, flexible members are connected to the inside edge of the bottom surface of the base of the first device. The interlocking system wherein 1 to 12, preferably 6, elongated, flexible members are connected to the outside edge of the bottom surface of the base of the second device. The interlocking system wherein 1 to 12, preferably 6, elongated, flexible members are connected to the inside edge of the bottom surface of the base of the second device. The interlocking system wherein the angled surface of any one of the elongated, flexible members is facing towards the center longitudinal axis of the circle. The interlocking system wherein the angled surface of any one of the elongated, flexible members is facing away from center longitudinal axis of the circle. [0081] The interlocking system wherein the first device further comprises a first ridge along the outside edge of the bottom surface. The interlocking system wherein the first device further comprises a second ridge along the outside edge of the bottom surface. The interlocking system wherein the second device further comprises a first ridge along the outside edge of the bottom surface. The interlocking system wherein the second device further comprises a second ridge along the outside edge of the bottom surface.

[0082] The interlocking system wherein the elongated, flexible members flange 205 and lip 211 are the feet 201 and flange 206 and lip 212 are feet 202 for the device when it is a hemisphere.

[0083] The interlocking system wherein the angled front surface 225 of the first elongated, flexible member flange 205 and lip 211 connected to the first device is movable in a first direction, wherein the second elongated, flexible member flange 206 and lip 212 connected to the second device is movable in a second direction opposite the first direction.

[0084] Although the base 100 may be formed of any material, such as wood, it is preferably made of a material such as PET, polypropylene, no-break polypropylene (polypropylene with added ethylene for extra resilience), filled polypropylene (the filler could be either glass or talc for extra rigidity) or PET. The various walls, flanges and the like of the base 100 may be about 0.15" thick. The platform may also be made of wood, in which case the platform would be solid and the ribs, rings and channels could be omitted.

[0085] During assembly, the bladder 50 is affixed on top of device hard inner dome 300 so that bottom 62 rests on channels and opposes the top of the hard inner dome of the device 300. A hole in the bladder can be further aligned with a hole in the bottom surface of the device 300.

[0086] Preferably, a short, rounded ridge 305 extends downwardly from the top, innermost part bottom surface 301 of the device around the longitudinal axis 20 of the hard inner dome of the device 300 for placement of an eye bolt 350. The eye bolt 350 is defined by a ring 355 with open hole for attachment of a removable device at one end and threaded male screw end 370 at the other end connected by a cylindrical shaft 360. The threaded male screw end 370 is screwed into the threaded female hole 310. The ridge provides a number of advantages. First, because it is rounded, it eliminates sharp edges that might tear or catch nearby fabric. Second, when the device is in use, the top of the clamp may receive some pressure from the user upon attachment of a device. Thus, the extra material at the ridge 305 also adds strength to the to the eye bolt 350. Preferably, the threaded screw is counter-sinked so that the surfaces remains flush.

[0087] The eye bolt 350 is preferably made of polypropylene, no-break polypropylene, high- density polyethylene, or any metal.

[0088] As shown in FIG. 5, a removable cover bottom cover 400 resembling a disc is defined by a bottom surface 402, a top surface 401, a side surface 405, a central hole 410, and two flanges 431 and 432. The central hole 410 is located at the center of the disc 400 and extends along the longitudinal axis 20 from the bottom surface 402 of the cover 400 to the top surface 401 of the cover 400. The radial distance of the central hole 410 from the longitudinal axis 20 varies such that the radial width is greater at the top and bottom of the hole than at the middle. The top 401 and bottom 402 surface of the removable disc cover 400 should have a diameter of 8 to 11 inches in the axial direction. The central hole 410 can be 1 to 2 inches in diameter in the axial direction.

[0089] The two flanges 431 and 432 are identical and located on opposite sides of the bottom cover at 180 degrees angles from the center of the disc. Each flange 431 and 432 is cylindrical in shape and defined by it a top surface 435 and 436 and side surface 433 and 434. Each flange side surface 433 and 434 extends outwardly in the axial direction from the bottom cover 400 side surface 405 by 0.02 to 0.5 inches. The top surface 435 and 436 of each flange 431 and 432 is a surface area that is approximately 0.1 to 2 square inches. The entire bottom cover 400 is designed so that when connected to the base 100 of the device, the side surface 405 is in contact with the inner base point 111 and extend in circumferential direction about the longitudinal axis 20 such that it in constant contact with the inside wall 130 of the base 100 when connected to the device.

[0090] An additional embodiment of the bottom cover disc includes two handles 421 and 422. These handles 421 and 422 are defined on the bottom surface 402 of the disc 400 by a hole 423 and 424 and a bar 425 and 426. The holes 423 and 424 are located at opposite sides of the center hole 410 of the disc 400 in the axial direction and each extends parallel to the longitudinal axis 20 from the bottom surface 402 of the cover 400 to the top surface 401 of the cover 400. The radial distance of each hole 423 and 424 from the longitudinal axis 20 varies such that the radial width is greater at the top and bottom of the hole than at the middle. Each hole 423 and 424 can be 1 to 2 inches in diameter in the axial direction. Each hole 423 and 424 has a bar 425 and 426 connected at two points to the opposite sides of each hole 423 and 424 and extending across the diameter of each hole 423 and 424 such that it resembles a partial ring that extends downward beyond the bottom surface 402 of the disc 400. Each bar 425 and 426 forms an arc with a cylindrical hole 0.05" to 2 in, and preferably 1" in radius. Preferably, each bar 425 and 426 forms an arc facing in the radial direction, and in line with the circumferential direction. Thus, the handles 421 and 422 have the shape of a hemi-sphere. The holes 423 and 424 should be large enough to let a person grip and move the device and permit the attachment of a removably attachable component to each bar 425 and 426.

[0091] The removable disc 400 and all its components are preferably made of polypropylene, no- break polypropylene, high-density polyethylene, or any metal.

[0092] As shown in FIG. 6, the removable disc 400 is secured to the base 100 of the device by way of a bayonet mount with a tongue and groove component. The flanges 421 and 422 of the removable disc 400 define the tongue and the grooves 251 and 252 are located along the inner base point 111 of the inner wall 130 of the base 100. The tongues 421 and 422 of the removable disc 400 are placed into the opening 255 of each groove 251 and 252 at which point the entire disc 400 is moved towards the top of the device and then rotated clockwise until each tongue 421 and 422 is located at the end 256 of each groove 251 and 252. Moreover, the outer portion of the grooves 251 and 252 overlays the inner portion of the tongues 421 and 422 to form a flush outer surface. The opening 255 of the grooves 251 and 252, respectively, are also aligned circumferentially on opposing ends of the base 100 so as to align directly with the tongues 421 and 422 of the removable base 400. This feature allows for the removable disc 400 to be connected to base 100 with either the bottom surface 402 or top surface 401 facing opposite a planar surface such as the floor. Preferably, the tongues 421 and 422 and grooves 251 and 252 are counter-sinked so that the bottom surface 402 and top surface 401 of the disc 400 remains flush with the inner base point 111 of the base 100.

[0093] When fully assembled, the device preferably weighs between 4 and 12 pounds, and even more preferably weighs about 8 pounds. It is desirable that the unit be light enough to be

transportable, but not so light that it moves from side to side when a person is active on it or jumping from one device to the other.

[0094] In operation, the plug is removed and bladder chamber is filled with air, fluid, or gel via hole. The plug is then replaced to seal the air, fluid, or gel in the chamber.

[0095] The concave nature of the base bottom accommodates the increased pressure without loss of stability. In order to remain stable, the base should maintain at least three points of contact with a planar surface such as floor; having only one or two points of contact may cause the base to wobble. The concave shape allows the base to retain the three points of contact. As the center of the base is pushed downward, it will expand into the gap between the base bottom and floor. Therefore, rather than resting on a bulging center, the device will continue to rest in a stable manner on the edges of the base.

[0096] As shown in FIG. 9, a variety of exercises may be performed in connection with the device. For example, to promote balance, users may stand or jump on the bladder. Attach a variety of removable accessories to the device including but not limited to ropes, elastic bands, push-up bars, weights, etc.... The accessories can be attached via the many attachment points, hooks, and holes on the device. The device can also be used right-side up or up-side down. [0097] The technology is new in three principle ways: firstly, no unstable surface ball of this size currently exists.

[0098] Secondly, no unstable surface product places as strong an emphasis on ergonomic design to prevent injury. For example, the most common injuries with doing pushups are related to damage to the shoulder and wrist. This product will address both joint-instability related injuries by having exercises performed on a unstable surface which has been shown to be effective in injury rehab populations, as well as for youth, elderly, and recreationally active populations. The push-up bars lower the pressure placed on wrists while doing push-ups, so the emphasis can be placed on the primary moving muscles to increase muscle activation and workout efficiency. Additionally, the balance board“lip” prevents rolling to prevent injury risk while using the invention.

[0099] Thirdly, no existing product is as easily transportable and provides the ability to have as effective a total body workout

[0100] All ranges disclosed herin are inclusive of the endpoints, and the endpoints are

independently combinable with each other.“Combinations” is inclusive of blends, mixtures, alloys, reaction products, and the like. The terms“first”,“second”, and the like, do not denote any order, quantity, or importance, but rather are used to denote one element from another. The terms“a” and “an” and“the” do not denote a limitation of quantity, and are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context.“Or” means“and/or” unless clearly stated otherwise. Unless stated to the contrary, use of the words such as“including,”“containing,”“comprising” and the like, means“including without limitation” and shall not be construed to limit any general statement that it follows to the specific or similar items or matters immediately following it.

[0101] Unless defined otherwise, technical and scientific terms used herein have the same meaning as is commonly understood by one of skill in the art to which this invention belongs. All cited patents, patent applications, and other references are incorporated herein by reference in their entirety. However, if a term in the present application contradicts or conflicts with a term in the incorporated reference, the term from the present application takes precedence over the conflicting term from the incorporated reference. [0102] Most of the foregoing alternative embodiments are not mutually exclusive, but may be implemented in various combinations to achieve unique advantages. As these and other variations and combinations of the features discussed above can be utilized without departing from the invention as defined by the claims, the foregoing description of the embodiments should be taken by way of illustration rather than by way of limitation of the invention as defined by the claims. While particular embodiments have been described, alternatives, modifications, variations, improvements, and substantial equivalents that are or may be presently unforeseen may arise to applicants or others skilled in the arts. Accordingly, the appended claims as filed and as they may be amended are intended to embrace all such alternatives, modifications, variations, improvements, and substantial equivalents.

[0103] I/We claim: