PURPOSE OF THE INVENTION The present invention as expressed in the statement of this design brief refers to a double grip for training and perfecting the sport of golf that helps to correct the angles of the body and the proper use of the arms and hands in the backswing as well as the angles of the body and the correct use of the arms and hands in the downswing without losing the correct angle of the club and the follow through of the swing. This invention was designed as a double grip joined by a hollow guide that comes out of the first grip and is embedded in the second. A rubber cord crosses from end to end through the inside of these two grips and thereby the hollow guide. At each end, there are caps that hook the rubber cord in a loop shape to keep it in place. This also allows you to make other hooks with other rubber cords that we call extension cords that we hook to the double grip on one end and on the other we hook it to other objects to allow us to do certain exercises to correct the deficiencies or errors in the areas of back swing, transition, down swing, impact and follow through.

FIELD OF APPLICATION FOR THE INVENTION The present invention has its application in the industry of products for the practice and improvement of the sport of golf.

PRECURSORS TO THE INVENTION The existence of exercise bands is known but the applicant is unaware of the existence of a mechanism of bands coupled to a double grip as described in this invention for perfecting the technique of golf swing.

The applicant, a recognised golf instructor, has devised a simple but extremely useful product for exercises that facilitate the practice of golf swing.

DESCRIPTION OF THE INVENTION The proposed rubber cord double grip provides clear advantages for training and correcting deficiencies of the golf swing. Which is definitively what improves the technique of a golfer. The innovation is in the coupling these two grips using an extension or hollow guide that comes out of handle A and that is coupled inside handle B (see Figure 1 - A and B) so that when we use handle A with two hands, handle B is coupled in such a way that it is not annoyance when doing exercises (see Figure 7) and likewise when we use one hand on each grip to separate them (see Figure 3). The hollow guide directs the separation and redirects the grips when they are reassembled to line up solidly. Grip A is longer than grip B (see Figure 1 ) because grip A can be used with both hands when performing certain exercises grip B is always used with only one hand for the effectiveness of the exercises. A rubber cord runs through the inside of this double golf grip (see Figure 3-D) with a stop or clasp attached to the rubber cord at each end while leaving the rubber cord in the form of a loop that will be very useful to make other couplings that will be explained later. At the external end of grip A is cap 1 and the end of grip B is cap 2 (see figure 1 numbers 1 and 2). We do golf swing exercises by placing one hand on each grip and pulling in the opposite direction (see Figure 3) and feeling how the rubber cord is stretched feeling pressure to help train deficiencies in the golf swing (see Figure 2 and 3) likewise a carabiner, ring or hoop can be attached to cap 1 onto which another extension cord can be hooked (see Figure 1 E). The other end can then be attached to a belt that is placed around the thigh that we call a thigh strap. The thigh strap can, of course, be placed on the thigh, but also the foot or even an object (see drawings 5, 6, 7, 8 and 11 ). The golf swing is then performed using grip A (with two hands placed around grip A) to notice the pressure when the elastic extension cord is stretched to do exercises on the backswing and making sure the angles of the body are correct. The same thing can be done by attaching an elastic extension cord from cap 2 to an object (see drawing 9, 10 and 12) to exercise the follow through of the hands and club after making impact with the ball without losing the correct body angles during the swing.

The elements that make up the invention are: · A DOUBLE HANDLE with a grip that we call GRIP A (figure 1 -A). It has a conical shape and its measurements vary depending on whether it is for man, woman or child but they range between 18 to 28 mm in diameter for the wide conical part and 12 to 20 mm in diameter for the narrowest part and between 160 to 250 mm long. GRIP B also has a conical shape and with 18 to 28 mm for the wide conical part and 12 to 20 mm for the narrow and that measures between 110 to 160 mm long). The variation in measurements is so that it can be used by men, women or children. It can be made of various materials (metal, hard plastic or similar) and coated with a layer made from rubber, soft plastic or a similar material.

• HOLLOW GUIDE. Grip A has an extension or hollow guide (figure 3-C) through the smaller conical part that is embedded in the second handle that we call GRIP B (figure 1 -B) and that serves to keep the double handle together when we use grip A in the exercises or to control the separation of the two grips when we do exercises with one hand on each grip and in turn to control the two grips when they come together again. The size of the hollow guide varies from 50 to 70 mm in length and from 8 to 12 mm in diameter (these sizes depend on whether it is for men, women or children).

• RUBBER CORD that goes through the double grip from one end to the other (Figure 3- D) and which has a stop or clasp on each end holding the elastic rubber in the form of a loop (cap 1 is at the end of grip A (Figure 1 -1 ) and cap 2 at the outer end of grip B (Figure -2)). The thickness and elasticity of the rubber cord depends on whether it is for child or adult use.

• RINGS, HOOPS OR CARABINERS (Figure 1 -E). They are attached to cap 1 and cap 2 or to the ends of the extension cords. 45 · EXTENSION CORD (figure 1 -F) with different lengths depending on the type of exercise we do and the object to which we are attached, the width of the extension cord will depend on whether it is used by children or adults (to vary the intensity of the elastic tension we use different diameters).

• THIGH STRAP (Figure 1 -G) made of fabric, nylon or similar material that is attached to the thigh and can be closed using a clasp, buckle or Velcro ® (Figure 1 -H) that is stapled or sewn to the ends of the THIGH STRAP for its closure and one steel, plastic or nylon ring (Figure 1 -1) for attaching the extension cord.

This DOUBLE GRIP helps us to correct the angles of the body and improve the use of arms and hands in the golf swing and also helps us to do exercises to move the club with the right plane. DRAWINGS

In order to facilitate the understanding of this design brief, a set of drawings consisting of the elements of which they are composed is attached. THE DOUBLE GRIP for the practice of golf exercises as well as different drawings that demonstrate their use and usefulness, seen on a right-handed golf player (in the case of a left-handed player it would be the reverse).

Figure 1 . Shows the double grip with its hooks, different lengths of extension cords and its hooks and thigh strap with a nylon ring. Figure 2. Shows the connected double grip (left hand grip A in the photo attached with right hand grip B).

Figure 3. It shows the separate and tensioned double grip caused by the rubber cord and we also see the hollow guide extending from the first grip. Figure 4. Shows the backswing of the club and we see how the left arm in this case is stretched and the right arm at about 90 degrees approx. Figure 5. It shows the attachment of the thigh strap and how the double grip is swung but in this case the player has both hands on grip A to correctly start the backswing of the golf club with the correct body angles.

Figure 6. Shows the attachment of the thigh strap and the correct position of the follow through of the golf club after impact and the correct angles of the body (both hands on handle

A).

Figure 7. It shows the attachment of the extension cord to the left foot for the correct backswing of the club maintaining the angles (the two hands on handle A).

Figure 8. Shows the attachment of the extension cord to the right foot and how the player is forced to pull the double grip feeling the correct follow through of the club after impact (both hands on grip A). Figure 9. Shows how the extension cord is attached to the branch of a tree to pull the double grip under it simulating how the release of the club is slowed down whilst maintaining the angle of arms and hands prior to impact (both hands on handle A).

Figure 10. Shows how to attach the rubber cord to an object (in this case in the branch of a tree) to feel the transition of the end of the backswing and the beginning of the downswing

(two hands on handle A).

Figure 11 . Shows the angle of the club in the middle of the backswing as well as angles of the body (both hands in grip A). Figure 12. It shows how other elements can also be used to attach the elastic extension rubber.

PREFERRED IMPLEMENTATION OF THE INVENTION

The proposed invention is a double grip (see Figure A and B) to which the player's hands are attached, characterised by a rubber cord that is inserted into one end of one of the handles and passes through the inside of it inside and goes out at the other end (The rubber cord is held at each end by a clamp bolt which keeps it in the shape of a loop so it can be hooked onto other things) (see Figure 1 numbers 1 and 2) and a hollow guide (it is hollow because the elastic passes through its interior) (See Figure 3-C) that protrudes from grip A and that is embedded in the interior of grip B to direct the two grips in the different exercises. This rubber cord can be fitted with other extension cords (see Figure 1 -F) for different fastenings or attachments to objects or points to carry out different exercises that improve or perfect any weaknesses in the golf swing in the stages of backswing, beginning of the downswing, the moment before the impact of the club on the ball, after the impact and end of the golf swing as well as the angles of the body in the stages described.

A fastening or hooking object can be a thigh strap (see Figure 5 and 6) characterised by a ring that can be nylon plastic or metal to hook onto an extension cord and the closure in this case is made with Velcro ®. Other fastening or hooking objects can be the player's foot (see Figures 7 and 8), a tree (see Figures 9, 10, 11 ), a golf car (see figure 12) and other objects such as a ring on the wall and so on.