US20040009826A1 - Golf swing training device - Google Patents

A golf swing training device comprises a club member and at least one weight member. The weight member includes a mating structure for securing the weight member to a complementary mating structure in the shaft portion of the club member. The weight member can be secured to the shaft in at least three positions including a first position at the top of the shaft adjacent the handle, a second position at or near the midpoint of the shaft and a third position at or near the distal end of the shaft.

BACKGROUND

• A weighted golf swing training device includes multiple settings for the placement of weights.

• This invention relates generally to athletic equipment and more particularly concerns golf swing practice equipment. However, the device described herein is also a training device for other sports, such as baseball and tennis, especially when used as an exercise device.

• There are many golf and other sport swing trainers in the marketplace which claim tremendous results through correct use on a consistent basis. While most of them have some merit and offer some benefits, they also can have one or more counterproductive deficiencies.

• One category of trainers includes those that are unweighted in comparison to actual golf clubs. Since these trainers are not weighted, they neither communicate to the muscles of the golfer in such a way as to break down muscle tension and old muscle habits, nor develop the proper muscle memory needed to produce a correct golf swing. Furthermore, while some of these unweighted devices feel good to swing, they tend to cause the golfer to swing the club over the top of the ball.

• Another category of trainers includes trainers that are statically weighted, such as by use of oversized or weighted club-heads, increased weights where the club-head would otherwise be located and weight mechanisms that are hinged to the club-head end of the shaft. These devices use a variety of straight or bent shafts. While these weighted devices will change muscle memory, since they are improperly weighted for the specific aspect of the swing being trained, they conform it to an improper swing. Thiey generally cause the club to be swung on an incorrect path, encourage the golfer to release the club too early and come over the top of the ball or cause the swing to be excessively wristy which also takes the club shaft off the correct path.

• A third category of trainers does not involve a golf club substitute at all, but employs swing guidance mechanisms such as hoops, tracks, belts and the like designed to force the golfer to swing an actual golf club or trainer on a proper swing path. Such devices are generally quite complicated and require much time in setting up for the unique physical characteristics of each individual golf student. Since they do not involve weighted mechanisms, they do not break down old incorrect muscle memory or build new correct muscle memory. Furthermore, these swing guidance mechanisms are generally based on the false premise that a golf swing takes place in a single plane. The golf swing is a bi-planar three-dimensional motion which known guidance mechanisms do not replicate.

• It is, therefore, an object of this invention to provide a swing trainer that is weighted so as to break down muscle tension and old muscle habits. It is a further object of this invention to provide a golf swing trainer which is properly weighted to develop the muscle memory appropriate to produce the correct golf swing. Further, this invention intends to provide a level of flexibility never before achieved with a swing training device. The key elements of this trainer allow it to evolve with the trainee so as the swing improves the trainer will continue to provide a level of benefit to the user. A further object of this invention is to provide a golf swing trainer that readily fits in a golf bag with the golfer's other equipment. It is also an object of this invention to provide a golf swing trainer that can be used anywhere, indoors or outdoors, as a trainer and also as a warm-up tool.

SUMMARY

• A golf swing training device comprises a club member and at least one weight member. The club member comprises a handle portion and a shaft portion extending from said handle portion. The shaft portion comprises shaft mating structure for fastening the weight member to at least three positions. These positions include a first position at the position adjacent to the handle portion on the opposite end from the distal end of said shaft portion. A second position is at the midpoint between the first position and the distal end of the shaft portion. A third position is at the distal end of the shaft portion. The weight member has weight mating structure for fastening the weight member to the shaft mating structure. At least one weight member is secured to at least one position along the shaft member.

• The shaft mating structure may comprise an outwardly threaded surface.

• In one example of the golf swing training device, the shaft portion has a unitary structure. The shaft mating structure may have shaft fastening bore holes, perpendicular to direction of the shaft, adapted to receive pins for fastening weights to the shaft. The weight member may have an annular configuration with a coaxial bore axially slidably received by the shaft portion. The weight mating structure may have weight fastening bore holes, complementary to the shaft fastening bore holes, perpendicular to and bisecting the coaxial bore. These weight fastening bore holes are adapted to receive pins for fastening weights to the shaft. The weight is fastened to the shaft by fastening pins.

• In another example of a golf swing training device, the handle portion is attachable to and detachable from the shaft portion. The shaft portion may comprise at least two shaft sections which are attachable to and detachable from one another and attachable to and detachable from the handle portion. The weight member is attachable to and detachable from the shaft sections and the handle portion. When the device is assembled for golf training the handle portion and the shaft sections are either connected to one another directly, or with at least one weight member in between (1) the handle portion and a shaft section and/or (2) two shaft sections. When positioned in this manner, the weight member also functions as an adapter connector to attach shaft sections to one another or to the handle portion. When the handle portion and said shaft sections are connected to one another directly, at least one weight member is attached to the distal end of said shaft portion.

• The handle portion, the shaft section and the weight member may be attachable to and detachable from one another by a male/female screw threading arrangement.

• The components of the golf training device may be provided in a kit, which, in turn, may be assembled into the golf swing training device. The kit may include at least three weight members. The weight members may be of the same or different weights.

• A method for training a golf swing using the golf swing training device may include the steps of:

• (a) positioning a weight member in the first position adjacent to the handle portion;

• (b) swinging said training device with the weight as positioned in step (a);

• (c) repositioning a weight member to the second position at the midpoint between the handle and the distal end;

• (d) swinging said training device with the weight as positioned in step (c);

• (e) repositioning a weight member to the third position at the distal end of the shaft portion; and

• (f) swinging said training device with the weight as positioned in step (e).

BRIEF DESCRIPTION OF THE DRAWINGS

• FIG. 1 is a three dimensional view of a golf swing training device with an outwardly threaded shaft.

• FIG. 2 is an exploded, disassembled view of the golf swing training device shown if FIG. 1.

• FIG. 3 is a three dimensional view of a golf swing training device, wherein a weight is secured to the shaft with pins.

• FIG. 4 is an exploded, disassembled view of the device shown in FIG. 3 without the weight attached.

• FIG. 5 is a three dimensional view of a golf swing training device with two weight members.

• FIG. 6 is a three dimensional view of a golf swing training device with three weight members.

• FIG. 7 is an exploded, three dimensional view of a golf swing training device with multiple club member components.

DETAILED DESCRIPTION

• FIG. 1 shows a golf swing training device having a

  club member

  10 and a

  weight member

  12. The

  club member

  10 has a

  shaft portion

  14 and a

  handle portion

  16. The

  club member

  10 has a

  shaft mating structure

  18 for positioning the

  weight member

  12 on the

  shaft portion

  14, and the

  weight member

  12 has a complimentary mating structure for this purpose. In FIG. 1, the shaft mating structure is shown as threaded

  surface

  20, which extends the entire length of the

  shaft portion

  14. The weight mating structure is the inwardly threaded surface (not shown in FIG. 1) of

  nut members

  22 and 24.

• In FIG. 1, the golf swing training device is assembled with the

  weight member

  12 positioned at the

  distal end

  13 of the

  shaft portion

  14, opposite the end of the

  shaft portion

  14, to which is attached the

  handle portion

  16.

• FIG. 2 is an exploded, disassembled version of the golf swing training device shown FIG. 1. The shaft mating structure has an outwardly threaded

  surface

  20. The weight member includes two inwardly threaded

  nut members

  22 and 24. The weight member also includes a

  lock washer

  26, having an outer diameter essentially the same as the outer diameter of

  nut members

  22 and 24. The weight member further includes five

  washer weights

  28, 30, 32, 34 and 36. An optional second lock washer (not shown) may be interposed between

  washer weight

  36 and

  nut member

  24.

• By means of the threaded

  shaft portion

  14 shown in FIGS. 1 and 2, one or more weight members may be positioned on any part of the threaded

  surface

  20 of the shaft. A

  first position

  38 is at the position adjacent to said

  handle portion

  16 on the opposite end from the

  distal end

  13 of the

  shaft portion

  14. A

  second position

  40 is at the

  midpoint

  42 between the

  first position

  38 and the

  distal end

  13 of said

  shaft portion

  14. A

  third position

  44 is at the

  distal end

  13 of the

  shaft portion

  14.

• It will be understood that modifications may be made to the structure of the golf swing training device shown in FIGS. 1 and 2. For example, the threaded portions of the shaft could be only in

  positions

  38, 42 and 44, with smooth, unthreaded sections between these positions. The diameter of the threaded shaft could be greatest in

  position

  38 and smallest in

  position

  44 to permit larger nuts in

  position

  38. These larger nuts could simply slide up the lower portion of the shaft without the need to screw the nuts up the entire length of the shaft in order to reach

  position

  38. It is also possible to use a

  detachable handle

  16, which may be removed for the purpose of placing a weight in

  position

  38.

• FIG. 3 illustrates another type of golf swing training device, wherein a weight is secured to the shaft by pins, which pass through the weights and shaft. In FIG. 3, a golf swing training device has a

  club member

  50 and a

  weight member

  52. The

  club member

  50 has a

  shaft portion

  54 and a

  handle portion

  56. The

  handle portion

  56 is opposite the

  distal end

  53 of the

  shaft portion

  54. The

  club member

  50 has a shaft mating structure for positioning the

  weight member

  52 on the

  shaft portion

  54 and the

  weight member

  52 has a complimentary mating structure for this purpose. In FIG. 3, the shaft mating structure is shown as shaft bore holes 60 and 61, which are shown in

  positions

  80 and 84 of the

  shaft portion

  14. The

  weight member

  52 is fixed at

  position

  82 by the shaft nmating structure, which is a bore hole (not shown in FIG. 3) and a complementary weight mating structure, which includes

  pin

  65.

  Pin

  65 passes through weight fastening bore holes (not shown in FIG. 3). These weight fastening bore holes are complementary to the shaft fastening bore hole (not shown in

  position

  82 in FIG. 3), perpendicular to and bisecting a coaxial bore of the

  weight member

  52.

• FIG. 4 is an exploded, disassembled view of the

  club member

  50 of FIG. 3 without a weight member attached. Shaft bore hole 62 is shown in

  position

  82. The

  weight member

  52 has an annular configuration with a

  coaxial bore

  70, which is sized so that the

  weight member

  52 is axially and slidably received by the

  shaft portion

  54, shown in FIGS. 3 and 4. Weight fastening bore holes 72, complementary to the shaft fastening bore holes 60, 61 and 62, shown in FIG. 4, are drilled in a direction perpendicular to and bisecting said coaxial bore 70. The weight fastening bore holes 72, and the complementary shaft fastening bore holes 60, 61 and 62, are adapted to receive

  pins

  65 for fastening

  weight members

  52 to the

  shaft portion

  54.

• FIG. 5 is a view of a golf swing training device with two

  weight members

  52 in

  positions

  82 and 84. When two

  weight members

  52 are positioned on the shaft, they can be in any possible combination of positions, including

  positions

  80 and 84 and

  positions

  80 and 82.

• FIG. 6 is a view of a golf swing training device with three

  weight members

  52 in

  positions

  80, 82 and 84.

• It will be understood that modifications may be made to the structure of the golf swing training device shown in FIGS. 3-6. For example, the

  shaft portion

  54 may have more than three shaft bore holes, e.g., up to ten shaft bore holes, so that weight members may be secured in more than three positions.

• The three

  positions

  80, 82, and 84 of bore holes 60, 61 and 62 shown in FIGS. 3-6 need not be limited to particular points along the shaft. For example, the first position may be within a section having a length of, e.g., 10% of the entire shaft length, which section connects to the

  handle portion

  56 of the club member. The

  second position

  82 may be within a section having a length of, e.g., 10% of the entire shaft length, which section intersects with the midpoint of the shaft. The

  third position

  84 may be within a section having a length of, e.g., 10% of the entire shaft length, which section includes the

  distal end

  53 of the shaft.

• It is also possible to have a weight member projecting outwardly from the

  distal end

  53. A counterbalancing weight may also be placed on the butt end of the

  handle portion

  56, opposite the

  distal end

  53.

• FIG. 7 is an exploded view of a golf swing device with multiple components. The

  handle portion

  116 is attachable to and detachable from the shaft portion. The shaft portion has two

  shaft sections

  114 and 115, which are attachable to and detachable from one another and attachable to and detachable from the

  handle portion

  116. The

  weight member

  112 is attachable to and detachable from the

  shaft sections

  114 and 115 and the

  handle portion

  116. When the device is assembled for golf training, the

  handle portion

  116 and the

  shaft sections

  114 and 115 are either connected to one another directly, or with at least one

  weight member

  112 in between (1) the

  handle portion

  116 and a

  shaft section

  114 and/or (2) two

  shaft sections

  114 and 115. When positioned in this manner. the

  weight member

  112 also functions as an adapter connector to attach

  shaft sections

  114 and 115 to one another or to the

  handle portion

  116. When the handle portion l16 and the

  shaft sections

  114 and 115 are connected to one another directly, at least one

  weight member

  112 is attached to the

  distal end

  113 of the shaft portion.

• The handle portion, the shaft section and the weight member may be attachable to and detachable from one another by a male/female screw threading arrangement.

• In the embodiment of FIGS. 1-2, especially when the

  shaft portion

  14 is composed of solid steel, the

  club member

  10 may weigh, for example, from 1 to 4 pounds.

  Weight member

  12 may vary in weight according to size and number of washer weights (e.g.,

  washer weights

  26, 28, 30, 32, 34 and 36 of FIG. 2), which are placed between

  units

  24 and 26. Each

  weight member

  12 may weigh, for example, from 4 ounces to 4 pounds.

• Similarly, in other embodiments, such as those shown in FIGS. 3-7, the club member may weigh, for example, from 1 to 4 pounds, and each weight member may weigh, for example, from 4 ounces to 4 pounds.

• The shaft member may be composed of any material strong enough to support the force generated by swinging the weighted club member. Such materials include metal, such as steel, plastic, wood and graphite. Composites of such materials may also be used. For example, the shaft member be essentially composed of plastic or wood with metal male or female screw connecting members embedded therein or otherwise attached thereto.

• Although not shown in FIGS. 3-6, the

  pin

  65 may be secured on the opposite end of insertion by a fastening device, such as a cotter.

• It will be understood that the present club member is distinguished from ordinary golf clubs for hitting golf balls. The present club member is adapted to function as a training device, and it is not adapted to hit golf balls. Also, the present club member includes shaft mating structure in at least three positions.

• When the shaft member has a unitary structure, such as shown in FIGS. 1-6, as opposed to a component structure, as shown in FIG. 7, this shaft mating structure may include at least one projection, such as an outwardly extending screw thread, or at least one indentation, such as a bore hole or inwardly extending screw thread, in each of the above-mentioned three positions.

• Examples of such projections include baffles or collar structures aligned to form a groove in the shaft. The weight member may have a donut type structure, of the shape shown by weight member of 52 of FIG. 4, except that the weight member is hinged along the outer diameter in a direction coaxial to the

  coaxial bore

  70. In the open position, the weight member has two semicircular, half donut shaped portions, which can be placed over the shaft in a grooved region between collars or baffles. These opened portions may then be closed in a fastened position, whereby outwardly projecting edges of the baffles or collars are in contact with the weight member and prevent it from sliding along the axial direction of the shaft when the weighted club member is swung.

• As shown in FIGS. 1-7, the shaft member is preferably straight, as opposed to cutved or slightly bent.

• The golf swing training device of the present invention is referred to hereinafter as the Trainer.

• The Trainer is a swing trainer that employs a shaft, such as a solid steel shaft, with various weight positions throughout the shaft. One end of the shaft is fitted with a training grip or standard grip, and the other end may be fitted with a protection cover. The training grip may have a contoured surface, which promotes proper grasping of the club for a golf swing. The top of the Trainer shaft may have a straight line down the shaft for alignment indication, and reference positions. The various weight positions allow weight to be distributed for correcting improper muscle memory when swung on the correct plane and therefore, developing the muscle memory in accordance with a correct swing on a correct swing plane.

• It is generally well stated that in actual play of one's sport, one's grip, stance, back swing, downswing and follow through, generally in that order, must be worked out and perfected and each stage of said swing coordinated before success as a player can be achieved. Having programmed the muscles to repeat the proper motion by use of the Trainer, the player is able to allow muscle memory to cause a repetition of the proper swing rather than mentally processing the components of the swing as the swing is made, a process most athletes recognize to be a futile exercise leading to disaster.

• The Trainer offers no assistance in hitting a ball but functions with surprising efficiency enabling the user not only to learn to time a swing, but also to swing along the correct plane so that a player will get the maximum club head speed at the intended point of ball impact and will thus condition a player in a manner to achieve better results when actually playing a game.

• The Trainer is designed to help improve the swing of a golf club, baseball bat, tennis racket or other sport requiring a swing. In reference to the golf swing, the trainer provides a novel method for developing an efficient, precise, repeatable and powerful golf swing which remains on the proper swing plane. The physical properties of the Trainer facilitate the learning of a swing which remains on a consistent swing plane with a proper release of the club-head at the moment of impact. The Trainer provides for the positioning of a weight at a variety of positions along the length of the shaft. The physical implications of moving this weight along the shaft are discussed hereinafter.

• First/Proximal Weight Position:

• With the weight in a position closest to the grip, in the golf swing, a player should think circular body movement and vertical arm movement. In the beginning of the swing a player needs to try to maintain the original set-up position having the arms, hands, and club-head in front of the chest. The hands and arms should remain aligned with the center of the chest. The arms and hands simply hinge and rise in the form of a back-swing as the body rotates. Unlike swinging a standard golf club or other swing aids, this invention provides instant feedback of improper movement of the hands, arms and body from the starting position to the top of the back-swing. Rather than taking a standard golf club or standard swing aid and swinging at full speed emulating a golf shot, the position closest to the grip is the key stage in developing and reinforcing the basic fundamentals of the back-swing. Using the trainer in this position, focusing on a circular (not horizontal) movement of the body and vertical (not around) motion of the club-head, a player will develop the rarely attained one piece takeaway.

• From the top of the back-swing, to the start of the down swing, a player must support weight with the arms (not hands) therefore allowing the arms to start the downswing in a dropping motion. When a player drops his or her arms supporting the weight with his or her arms, the player will position the club properly on the original swing plane. When using the Trainer with the weight at this first position, the weight is to perceived as being equally distributed in the arms. If at any time the perception of the weight is not in the arms, the player has made an incorrect movement. This perception can be amplified by increasing the amount of weight positioned closest to the grip.

• The transition from the top of the back-swing to the bottom of the downswing initiating contact should feel like the arms have initiated a smooth and rhythmic motion towards the golf ball. When using the Trainer in this transition movement, the tempo must be slow and deliberate with no jerking motion. By having the weight in this first position, it will reinforce the proper rotation of the arms throughout the hitting zone, and not the improper folding of the hands at impact.

• The follow through is simply a mirror image of the back-swing, the body must rotate in a circular motion as the arms must pick the club up and over the body in a vertical motion, not around the body to finish in a proper position on the body's leading side of the target. The positions of the arms, hands and club-head stay in front of the chest as the arms carry the club vertically and the momentum of the body brings club up and over the body.

• Second/Central Weight Position:

• With the weight in a central position, the static weight of the Trainer does not change but the trainer is perceived to be heavier due to the greater amount of centripetal force and torque generated. Because of this increased weight perception, a player's movements have greater impact throughout a swing, thus ensuring more use of arms rather than hands to perform a proper swing through the hitting area. The additional feel of weight then allows and forces the club to be thrown away from the body through a player's impact zone.

• The transition from the top of the back-swing to the bottom of the downswing initiating contact should feel like the arms have initiated a smooth and rhythmic motion towards the golf ball. When using the Trainer in the second position, the tempo must be slow and deliberate with no jerking motion. By having the weight in the central position it will encourage the player to maintain the proper angle allowing the club to drop into the proper swing plane, rather than fall on an incorrect path. By maintaining this angle, a player's muscle memory will change from casting the golf club to dropping the golf club into the so called “slot”, thus producing a proper, and much more powerful position at impact.

• Again, as with the first position, the follow through at the central position is simply a mirror image of the back-swing; the body must rotate in a circular motion as the arms must pick the club up and over the body in a vertical motion. With the weight in the second position during the follow through, the Trainer will now feel like it is being thrown away from the body ensuring a proper in to out swing path with the position of the arms, hands and club head maintaining a center position in front of the chest and the momentum of the body finishing strong on the players leading side towards the target.

• Third/Distal Position:

• Having programmed the muscles to repeat the proper motion by use of the Trainer, the player is able to allow muscle memory to cause a repetition of the proper swing. Through the first two weight positions, muscle memory has been built to the point were the player is now able to use the advanced third/distal weight position effectively. In the third position the basic principles remain unchanged in regard to the swing mechanics. The emphasis now becomes maintaining control of the dramatically increased perceived weight. Such emphasis to be placed upon increased angle position at the top of the back-swing, therefore, allowing a stronger release through the hitting area (defined as the region between 3 and 9 on a clock with 6 being the position of the golf ball). The key fundamental emphasis of using the trainer with the weight in the third position at the top of the back-swing is to maintain the proper angle and keep the weight perception in the arms. If the weight is not controlled by the arms, the weight will drop in the hands and fall behind generating an unmistakable over-the-top motion to attempt to get the club through the hitting area. When the weight is maintained properly, the player will then be able to bring the arms and hands back in front of the chest along the swing plane resulting in a proper in to out release through the hitting area. With the weight in the third position the emphasis through the hitting area will be easily obtainable by maintaining the proper angle previously referenced. The movement through the hitting area must include a full release and extension of the arms, not hands, on an in-to-out path. With the increased perceived weight, the club will automatically feel like it is being thrown away from the body, therefore, ensuring a proper, precise, powerful and most importantly, natural release.

• As stated previously, the follow through is a mirror image of the back-swing. When the weight is in the third position and the proper release has been achieved, the common mistake is to finish the follow through by picking the club tip with the hands. This movement will be extremely difficult because of the increased perceived weight, but if the arms pick the club up, as in the back-swing, the natural motion will feel effortless as the centripetal force allows the player to finish the swing strongly on the leading side toward the target.

• Description of Physics and Principles at Work in the Trainer

• The key physical principle being utilized in the Trainer is that of centripetal force. Centripetal force is equal to the mass of an object multiplied by the velocity of that object squared and then divided by the radius of the circular path that object is traveling (Centripetal Force=(Mass×Velocity ²)/Radius). Thus, when swung at a constant velocity, the centripetal force being generated is defined by the mass of the Trainer (Mass) and the length of the Trainer shaft (Radius). Both of these elements are practically infinitely variable in this invention. Any amount of weight, which is not excessively heavy, may be added to the shaft, and, according to certain embodiments of the present invention, this weight can be secured at any point along the shaft, generating an effective radius that is shorter as the weight approaches the handle. Adjustment of the weight alters the shaft's center of gravity in the direction the weight is moved. Given a constant weight, when the weight is closest to the handle, the effective radius of the circular swing path is at its shortest, providing for the generation of the minimum amount of centripetal force. Generating a smaller amount of effective centripetal force provides for a less forceful swing. As the weight is moved away from the handle, the effective centripetal force becomes greater, providing for a more forceful swing requiring more active precision by the user.

• Even when the shaft of the Trainer is adapted to receive weights in only three positions, the center of gravity of the shaft can be varied by placing two or more weights on the shaft in different positions. For example, when weights are placed in both the first/proximal position and the second/central position, the center of gravity will be between the center of gravity, when the same weight is only in the first position, and the center of gravity, when the same weight is only in the second position.

• Anatomical Function of the Trainer

• The swing training device provides a method to train and strengthen all the major muscles used in the golf swing. Specifically, swinging of the device activates muscle contraction leading to muscle memory in the large muscles of the back including Teres major, Infraspinatus, Rhomboids, Latissimus dorsi and the Erector spinae. As spine angle is a key element in a precise and repeatable golf swing, having proper strength and muscle memory in the muscles of the back is critical. Key muscle groups of the arms that are activated and trained through the use of the swing trainer include the Brachioradials, Brachialis, Triceps and Biceps brachii, wrist extensors and forearm flexors. Use of the training device ingrains the proper feel of muscles which should be activated and used predominately in the swing, making the sensation an ingrained physical perception which can be repeated when making a normal swing. The major muscles of the shoulders are also targeted through use of the swing training device including the Trapezius, Anterior, Medial and Posterior heads of the deltoid. Additionally the major supporting muscles of the mid-section including the Rectus abdominus and both internal and external obliques are trained through the use of the training device providing increased strength and flexibility facilitating a proper swing. Finally, all the major muscles of the lower body including the Rectus femoris, Vastus lateralis, Vastus medialis, Biceps femoris, Semimembranosus, Semitendinosus and Gastrocnemius are all effectively activated through the use of the trainer. The training device is an excellent total body training device which through swinging and/or through using in a series of defined exercises, provides a total body training system for athletes involved in golf, baseball, tennis and other sports requiring a swing.

• Physical Description:

• The Trainer includes a shaft, that can be any length, but generally will be between 26″ and 40″ in length, that can be any diameter, but generally will be ½″ or ⅝″. There is a grip end where the Trainer is held. There is a system so as to allow a variable amount of weight to be positioned at three positions or more along the shaft. This can be accomplished through many mechanisms. As described above in connection with FIGS. 1 and 2, one embodiment includes a threaded shaft, with weighted members, which may have approximately 2″ outer diameter (OD) and an inner diameter (ID) of sufficient size as to allow it to fit over the threaded shaft. The weighted members are held in a position along the shaft by two nuts, such that when the two nuts are tightened against each other, the weighted members are held in position, unable to slide freely. The weighted members can be of variable thickness so as to allow a variable amount of weight to be positioned along the shaft. The threaded mechanism provides for an indefinite number of positions, such that the weight can be positioned and secured at any position along the shaft.

• Another mechanism for securing variable weight to the shaft involves one or more variably weighted weight cartridges, used as a replacement for the

  weight members

  52 of FIGS. 3-6. This cartridge may consists of a cassette providing for the storage of a variable number of weighted units within the cassette. The cassette is designed in such a way that the weighted units are inserted within it and the cassette is then closed so that the weighted units are secured. The cassette and the weighted members have an inner diameter of sufficient size as to allow them to fit over the shaft. There may be a ¼″ hole passing transversely through the cassette in a manner perpendicular to the center hole. There may be complimentary ¼″ holes positioned along the shaft. When the weighted cassette is passed over the shaft and corresponding ¼″ holes are aligned, a ¼″ cotter pin or cotter-less pin with spring assembly can be passed through both the weighted cassette and the center shaft to secure the two pieces together. The pin can be removed and the weighted member can be repositioned at any point along the shaft, including a complimentary ¼″ hole, and re-secured with the pin.

• Another mechanism providing for variable weight at varying positions along the shaft involves the embodiments of FIGS. 3-6, wherein a weighted member of appropriate OD and ID so as to allow it to freely pass over the shaft. The weighted members are of variable thickness. Each weighted member has a ¼″ hole passing transversely through it such that the ¼″ hole is perpendicular to the inner hole passing tlirough the weighted member. The shaft has a variable number of corresponding ¼″ holes positioned along its length such that the weighted member can be positioned over the shaft and secured with a cotter pin or cotter-less pin with spring assembly.

• Any other possible mechanism for achieving variable weight and position of that weight is encompassed in the spirit of the invention.