WO2010120378A2 - Portable gym using gravitational forces - Google Patents

Abstract

A portable gym using gravitational forces of the present invention includes a gravity gym assembly and a belt harness. The gravity gym assembly includes a door anchor that is attachable to any doorway having a door, and an adjustable strap that leads to a pulley through which a cable passes. The cable is equipped with detachable handles on each end and may be advanced back and forth through the pulley when forces are applied to the handles. A series of exercises may be accomplished by varying body position, and exercises the entire body by using the person's body weight for resistance. In an alternative embodiment, the portable gym using gravitational forces may include attachment of the cable ends to the belt harness worn around the waist of the athlete and provides for the stabilization and application of resistance on the body while exercising. Exercises that are primarily performed in the gym, including, strengthening shoulder, arm, chest, back, leg, and abdominal core muscle groups, and performing cardiovascular and plyometric movements, can be performed virtually anywhere using the portable gym using gravitational forces of the present invention.

Description

UNITED STATES UTILITY PATENT APPLICATION

FOR PORTABLE GYM USING GRAVITATIONAL FORCES

BY DANNY THAI HESTER

RELATED APPLICATIONS

The present application claims the benefit of priority from United States Provisional Patent Application entitled "Pocket Perfect Gym", filed April 17, 2009, and currently co-pending.

FIELD OF THE INVENTION

The present invention relates generally to exercise devices. The present invention is more particularly, though not exclusively, useful as an exercise device to perform exercises that are typically performed in the gym, and can be performed anywhere with a strong structural base such as a door way, tree branch or fence.

BACKGROUND OF THE INVENTION Early history has provided evidence that man has long been aware of the benefits of physical fitness, and in the development of strong muscles. In fact, the Spartans and Greeks are thought to be some of the most physically fit societies that have ever existed. As early as the 18^th century, man has developed exercise devices to assist with the development of muscles and general fitness.

One of the first known exercise devices was the "chamber horse" designed in the late 18^th century. This device included a chair-like seat having a series of springs under the seat portion and a pair of handles extending from the arms of the chair. The person exercising would grip each handle, and bounce up and down to simulate the riding of a horse, to strengthen the legs an torso.

While the "chamber horse" was a very basic and rudimentary device, it represents the start of a trend that included the introduction of exercise devices into the mainstream household. Over the centuries, there have been many improvements on the chamber horse, and the creation of an endless variety of exercise devices.

Hand-in-hand with the growing popularity of exercise devices came the growing awareness of the day-to-day benefits of strength and cardiovascular fitness. Perhaps one of the best known advocates of fitness and strength training was Angelo Siciliano (later known as Charles Atlas) who developed the "Charles Atlas Exercise Program" in the early 1920s. The Atlas program is likely one of the longest-lasting programs to date, and owes is longevity in part to the consistent advertising of the "Dynamic Tension" exercise program. "Dynamic Tension" is a self-resistance exercise method which pits muscle against muscle. The practitioner tenses the muscles of given body part and then moves the body part against the tension as if a heavy weight was being lifted. "Dynamic Tension" exercises are not merely isometrics, since they include movement. Instead, the method comprises a combination of exercises in three disciplines: isotonic, isokinetic, and some exercises in the isometric discipline. No apparatus are required to practice Atlas' "Dynamic Tension" program, and thus it was affordable and appealed to many as the in-home fitness solution.

Following in the footsteps of Charles Atlas, Jack LaLanne and Joe Weider each came up with their own personal physical fitness program that included diet, exercise, and weight training. Unlike Atlas' program, however, both LaLanne and Weider programs required the use of weight training. In fact, Weider developed an entire line of weight-lifting and bodybuilding exercise equipment to accompany his fitness program.

Modern day exercise devices for building and strengthening muscles range from the basic barbell and weight bench, to large-scale universal gyms. The "Universal Gym" was developed in 1957 and was the first multi-station selectable-weight training machine. Over the years, the "Universal Gym" has gradually been replaced by highly engineered weight training stations.

In addition to weight-based devices, a variety of exercise devices have been designed to focus equally on cardiovascular fitness. These devices include computerized stationary bicycles, treadmills, stair-stepping machines, elliptical trainers, and rowing machines. These devices are used to elevate heart rate for a sustained period of time to improve the cardiovascular health. While fitness techniques have ranged from the "Dynamic Tension" exercises promoted by Atlas, to the equipment-based exercises promoted by LaLanne and others, there is a gap in the available products and techniques. Specifically, the "Dynamic Tension" techniques are limited by the absence of any apparatus designed to improve specific muscle strength and function. On the other hand, the equipment-based exercises require expensive, bulky, and often very complicated, gym equipment. As a result of these two disparate options, a person must choose between an at-home, equipment- less exercise program, or invest thousands of dollars to purchase the latest state-of-the-art equipment for home or join a gym that has that equipment available at an often significant cost.

In light of the above, it would be advantageous to provide an exercise device that provides the athlete with the apparatus necessary to exercise fully all muscle groups in the body. It would also be advantageous to provide an exercise device that is portable thus eliminating the need for bulky equipment or gym memberships. It is further advantageous to provide an exercise device that is easy to set up, easy to use, and comparatively cost effective.

SUMMARY OF THE INVENTION

The portable gym using gravitational forces of the present invention includes a gravity gym assembly and a belt harness. The gravity gym assembly includes a door anchor that is attachable to any doorway having a door, and an adjustable strap that leads to a pulley through which a cable passes. The cable is equipped with detachable handles on each end and may be advanced back and forth through the pulley when forces are applied to the handles. A series of exercises may be accomplished by varying body position, and exercises the entire body by using the person's body weight for resistance. In an alternative embodiment, the portable gym using gravitational forces may include attachment of the cable ends to the belt harness. The belt harness is worn around the waist of the athlete and provides for the stabilization and application of resistance on the body while exercising.

Exercises that are primarily performed in the gym, including, strengthening shoulder, arm, chest, back, leg, and abdominal core muscle groups, and performing cardiovascular and plyometric movements, can be performed virtually anywhere using the portable gym using gravitational forces of the present invention.

BREIF DESCRIPTION OF THE DRAWINGS

The objects, features, and advantages of the method according to the invention will be more clearly perceived from the following detailed description, when read in conjunction with the accompanying drawing, in which:

Figure 1 is an assembly view of the portable gym using gravitational forces of the present invention showing the gravity gym assembly having a door anchor, adjustable strap that leads to a pulley having a cable equipped with an attachable handle at each end, and a corresponding belt harness attachable to the cable;

Figure 2 is a perspective view of the portable gym using gravitational forces of the present invention showing an athlete using the portable gym attached to a doorway and engaged in exercise;

Figure 3 is a perspective view of the portable gym using gravitational forces of the present invention showing an athlete using the portable gym attached to a doorway and engaged in exercise with an inclined body position thereby increasing the gravitational forces applied to the exercise; Figure 4 is a is a perspective view of the portable gym using gravitational forces of the present invention showing an athlete using the portable gym and belt harness attached to a doorway and engaged in exercise showing the range of body movement in a side-to-side and rotational direction;

Figure 5 is a perspective view of the door anchor of the portable gym using gravitational forces of the present invention showing the stop positioned between a door and the door frame (shown in phantom) adjacent the hinge;

Figure 6 is a is a perspective view of the door anchor of the portable gym using gravitational forces of the present invention showing the stop positioned between a door and the door frame (shown in phantom) distant from the hinge; Figure 7 is a is a perspective view of the handle of the portable gym using gravitational forces of the present invention showing the handle strap and grip having a pad; Figure 8 is a perspective view of the portable gym using gravitational forces of the present invention showing an athlete using the portable gym attached to a doorway, with the athlete facing toward the door and engaged in an arm curl exercise with an inclined body position thereby increasing the gravitational forces applied to the exercise;

Figure 9 is a perspective view of the portable gym using gravitational forces of the present invention showing an athlete using the portable gym attached to a doorway, with the athlete facing away from the door and engaged in an arm butterfly exercise with an inclined body position thereby increasing the gravitational forces applied to the exercise;

Figure 10A-C is a series of views of the portable gym using gravitational forces of the present invention showing an athlete using the portable gym attached to a doorway, with the athlete facing toward the door and engaged in an upright rowing exercise with varying angles of inclined body position thereby increasing the gravitational forces applied to the exercise, and a bar graph representation corresponding to the proportion of the gravitational forces experienced by the athlete; and

Figure 11A-C is a series of views of the portable gym using gravitational forces of the present invention showing an athlete using the portable gym attached to a free-standing post, with the athlete using the portable gym and belt harness in exercise showing the range of cardiovascular and plyometric body movements including for example, squats and lunges. DETAILED DESCRIPTION

Referring initially to Figure 1 , an assembly view of the portable gym using gravitational forces of the present invention is shown and generally designated 100. Portable gym 100 includes a gravity gym assembly 102 and a belt harness 104.

Gravity gym 102 assembly includes a door anchor 110. Door anchor 110 includes a stop 112 that is enlarged compared to the relatively thin door anchor strap 114. As will be discussed in greater detail in conjunction with Figures 5 and 6, the stop 112 is enlarged so as to prevent the stop from passing between a door and its frame.

Clip ring 116 attaches anchor strap 114 to ring 118 that is attached to leader strap 120. Adjustable clamp 122 attaches leader strap 120 to adjustable strap 124 so that the overall length of the combination of leader strap 120 and adjustable strap 124 can be adjusted and secured. This adjustment capability provides for the use of the gravity gym assembly in nearly any setting.

Adjustable strap 124 ends with a ring 125 that attaches to clip ring 126 which clips to a pulley 128. Pulley 128 includes an axle 132 which supports a wheel 130 sized to receive a cable 134. In a preferred embodiment, cable 134 may be a polymer encased steel cable to provide suitable durability and strength. Alternative cabling as is known in the art may be used without departing from the present invention.

Each end of cable 134 includes a cable stop 136 and loop 138. Cable stop 136 is sized so that the cable stop 136 cannot pass through pulley 128 thereby preventing the cable 134 from passing entirely through pulley 128. A clip ring 140 attaches to loop 138 and may be attached to a handle 142. Specifically, handle 142 is formed with a ring 144 that is removably clipped to clip ring 140 to secure the handle 142 to the gravity gym assembly 102. The portable gym using gravitational forces 100 of the present invention also includes the belt harness 104. The harness 104 includes a strap pad 160 which is attached to an elongated strap 162 having an adjustable clip 164 on one end, and a clip receiver 166 on the other end. It is to be appreciated that adjustable clip 164 provides for the adjustment of the length of strap 162 and is securely received in clip receiver 166 so as to secure the belt harness around an athlete's body, such as the waist or chest.

A pouch 170 may be attached to, or formed integral to, strap pad 160 and equipped with a zipper 172. In a preferred embodiment, gravity gym assembly 102 can be stored fully within pouch 170 of the belt harness 104 to provide for the easy and convenient transportation and storage. Moreover, because the portable gym 100 using gravitational forces of the present invention is highly versatile, the ability to easily transport the gym on an athlete's waist is highly advantageous for walkers, joggers, and cyclists. An accessory pouch 174 attached to strap pad 160 provides additional storage for an athlete during these periods of transportation, and are perfectly suited for personal electronics, such as cellular telephones and i-pods.

A pair of belt rings 176 are securely attached to the strap 162 adjacent each end of strap pad 160. As will be shown in greater detail in conjunction with Figure 4, clip ring 140 of the gravity gym assembly 102 may also be attached to belt rings 176 for additional exercises. In such configurations, handles 142 can be removed from gravity gym assembly 102, or they may remain in place on clip rings 140 and adjacent belt rings 176. Referring to Figure 2, a perspective view of the portable gym using gravitational forces 100 of the present invention is shown as typically used by an athlete 200. As shown, gravity gym 102 is attached to a structure, such as a doorway by positioning stop 112 inside a door 210 so that anchor strap 114 passes between the door 210 and the door frame 208. Once the door 210 is securely closed, the door anchor 110 is securely captured in place.

As shown in this Figure, athlete 200 is facing away from door 210 and gripping handles 142 and engaged in exercise of the torso 202, right arm 204 and left arm 206. As can be understood from this Figure, when right arm 204 is moved forward and away from the door 210, cable 134 passes through pulley 128 causing left arm 206 to move backwards toward door 210.

Figure 3 provides another perspective view of the portable gym using gravitational forces 100 in the same basic exercise as shown in Figure 3, provided that the position of the athlete 200 provides increased resistance on the movement of arms 204 and 206, and increased needs of core muscle strength in torso 202 due to the athlete's inclined position relative to the ground. More specifically, the athlete depicted in Figure 3 has positioned his feet 224 closer to the door 210 than in Figure 2. This foot position results in an increase in the angle of the athlete's body position. In this non-vertical position, the forces exerted on the arms 204 and 206 are much greater due to the effects of gravity. The forces that are experienced by arms 204 and 206 as they pass through motions 214 and 216 are far greater due to the athlete's inclined position. Also, the strength requirement for core muscles in torso 202 is greatly increased as the athlete must maintain a proper body position and posture.

Referring now to Figure 4, a perspective view of the portable gym using gravitational forces 100 of the present invention is shown and includes an athlete 200 using the gravity gym 102 along with the belt harness 104. As shown in this Figure, belt harness 104 attaches about the waist of athlete 200 by inserting adjustable clip 164 into clip receiver 166. Once in position, clip rings 140 are attached to belt rings 176. As shown, the belt harness 104 is positioned on athlete 200 so that strap pad 160 is adjacent his stomach. It is to be appreciated, however, that the belt harness 104 may be positioned around athlete 200 so strap pad 160 is adjacent his back or sides, and may even be worn higher on the abdomen 220 if desired. In a preferred embodiment, the strap pad 160 is positions so that the bulk of the force applied through the harness occurs at the strap pad to provide padding and minimize discomfort to the athlete.

As shown, gravity gym 100 is attached to a door 210 and door frame 208, and cable 134 is taut. In this configuration, athlete 200 may engage in a number of exercise routines, and has freedom of movement in rotational directions 222, as well as side to side 226 and 228 motion. In some exercises, a padding, or slide mat, 230 may be used to allow the cushion or sliding of feet 224. Referring now to Figure 5, a perspective view of the door anchor 110 of the portable gym using gravitational forces 100 shows the anchor stop 112 positioned on the opposite side of a door 210, with anchor strap 114 passing between door 210 and door frame 208 and immediately adjacent hinge 212 (shown in phantom). By positioning the door anchor 110 adjacent hinge 212, a significant pulling force may be exerted on leader strap 120 without fear of damaging the door or frame.

Figure 6 is another perspective view of the door anchor 110 of the portable gym using gravitational forces 100 showing the anchor stop 112 positioned on the opposite side of a door 210, with anchor strap 114 passing between door 210 and door frame 208 (shown in phantom). In this installation, the door anchor 110 is distant from the hinge 212 and demonstrates that there is no limit to the positioning of door anchor 110. Also, as shown in Figures 5 and 6, the anchor stop 114 is positioned on the side of door frame 208 opposite hinge 212. It is to be appreciated that this is merely exemplary, and that the anchor stop 114 may be positioned on the side of the door frame 208 that has hinge 212, with the anchor strap passing between door 210 and door frame 208 in the opposite direction as shown in these figures.

Anchor strap 114 is shown to be formed with a loop 150 through which clip ring 116 passes. As will be more fully discussed in conjunction with Figure 11 , gravity gym 102 may be attached to other structures by removing door anchor 110 and clipping clip ring 116 around leader strap 120. In this manner, the portable gym using gravitational forces 100 of the present invention may be attached to any sturdy structure, from manmade doorways, railings, posts, and ceiling joists, to natural structures, such as trees and rocks.

Figure 7 is a perspective view of the handle 142 of the portable gym using gravitational forces 100 of the present invention. This figure shows the handle strap 146 formed with a stitched loop 152 around ring 144. Handle strap 146 passes through a bore 154 formed in grip 148 to provide a robust gripping surface. This results in a fail-proof design in which, even in the unlikely event grip 148 breaks, strap 146 passes through the athlete's hand thereby preventing the uncontrolled release of cable 134. A pad 156 may be provided to grip 148 to assist with the gripping surface by providing a slip-free surface, while adding a layer of padding to distribute the pressure on the athlete's hand.

Specific Exercises

The portable gym using gravitational forces 100 of the present invention is designed to be useful for accomplishing a near unlimited number of exercises focusing on the strengthening of all muscle groups, and providing a cardiovascular workout. In order to demonstrate the versatility of the portable gym using gravitational forces 100, a number of exercises are depicted in the drawings. It is to be understood that these exercises depicted are merely exemplary of the versatility of the present invention, and are not in any way to be construed as a limitation on the specific exercises, or environments, for which the present invention may be utilized. A basic arm curl exercise is shown in Figure 8. Specifically, a perspective view of the portable gym using gravitational forces 100 of the present invention is attached to a doorframe 208 and being used by an athlete 200 facing toward the door 210. As shown in this exercise, the athlete has positioned his feet 224 slightly towards the door 210. By gripping handles 142 with his arms 206 and 208 in a curled position, he retains his torso in position 220. By slowly decreasing the muscle tension on his arms 206 and 208, gravitational forces pull athlete 200 in direction 240 to a new position 220' (shown in dashed lines) with his arms fully extended. In this resting position, gravity provides a force upon athlete 200 that must be overcome in order to return to his original position 200. This motion, commonly referred to as an upright curl, is repeated thereby strengthening the core muscles in torso 220, as well as all shoulder and back muscle groups. As will be discussed more fully in conjunction with Figure 10A-C, by positioning the athlete's feet 224 closer to the door 208, the forces experienced by the athlete due to gravity are increased.

Referring now to Figure 9, a perspective view of the portable gym using gravitational forces 100 of the present invention is shown and depicts an athlete 200 using the portable gym 100 attached to a doorframe 208. In this exercise, the athlete 200 is facing away from the door 208 and engaged in an arm butterfly exercise. This exercise begins with the athlete standing substantially upright, and his arms 206 and 208 are extended forward and together from torso 220 and gripping handles 142. As he relaxes the chest and shoulder muscles, his arms 206 and 208 move outwards to positions 206' and 208' as his body moves forward in direction 242 to a new position 220'. In position 220' the athlete is in an inclined body position thereby increasing the gravitational forces experienced. By returning his arms from positions 206' and 208' to their original position, the athlete returns to his original position 220. This motion, commonly referred to as a butterfly, is repeated thereby strengthening the core muscles in the torso 220, as well as all pectoral, latissimus dorsi, shoulder and back muscle groups. Again, as will be discussed more fully in conjunction with Figure 10A-C, by positioning the athlete's feet 224 closer to the door 208, the forces experienced by the athlete due to gravity are increased. Figure 10A-C include a series of views A-C of the portable gym using gravitational forces 100 of the present invention showing an athlete 200 using the portable gym 100 attached to a doorframe208. In these views, note that the overall length 248 of portable gym 100 remains constant, and the athlete 200 is facing toward the door 210 and engaged in an upright rowing exercise with varying angles of inclined body position thereby increasing the gravitational forces applied to the exercise. For instance, if athlete 200 was standing vertically, the amount of gravitational force applied to his arms would be essentially zero. This would be due to his center of gravity 249 being directly over his feet 224. Correspondingly, the closer to the door athlete 200 places his feet 224, the farther his center of gravity 249 is from being vertically above his feet 224, and the greater the forces required to raise his body position.

More specifically, in Figure 10A, the athlete's feet 224 are a distance 251 from door 210 resulting in his body axis (shown in dashed lines) being at an angle 250 towards the ground. This angle 250 is nearly a 90 degree angle as his posture is near vertical. The bar graph representation 252 corresponds to the proportion of the gravitational forces experienced by the athlete. In this case, the gravitational forces are minimal, and the intensity of the workout using this position would be low.

Referring to Figure 10B, athlete 200 has now positioned his feet 224 a distance 255 from door 210, thereby creating an angle 254 with the ground. As shown in this Figure, distance 255 is less than distance 251 and athlete's 200 center of gravity 249 is no longer substantially aligned over his feet 224, and thus, the bar graph representation 256 indicates a higher gravitational force required to raise his body position.

In Figure 10C, athlete 200 has positioned his feet 224 even closer to door 210 at a distance 259. This creates an angle 258 with the ground, with his center of gravity 249 greatly offset from his feet position. In this case, the gravitational forces are extraordinarily high, and approach the gravitational pull on his entire body. In fact, depending on the height 262 that gravity gym 102 is attached to a structure, the gravitational (vertical) component 264 of the downward forces can vary.

The various exercises that have been shown herein have demonstrated the bilateral exercise of the arms; however, it is to be appreciated that the specific exercises may be performed using both arms, or may also be performed using only one arm. In this manner, a specific muscle, or muscle group can be isolated for a more focused workout. It is also to be appreciated that in the process of utilizing the present invention, resistance can be introduced into the workout by adjusting the position of the feet, as well as by applying counter-forces by the opposing limb. For instance, when doing a one-armed exercise, the second arm must counteract the movement of the cable thereby increasing the resistance experienced by the athlete. An example of this bi-directional force would include a biceps of one arm being contracted to draw that arm towards the body, while the triceps of the other arm must be contracted to push the other arm away from the body.

Also, in a preferred embodiment, axle 132 may not allow wheel 130 to rotate freely within pulley 128 thereby introducing additional resistance into the system thereby providing a more vigorous exercise. Additional resistance can be introduced by attaching the portable gym using gravitational forces 100 of the present invention to a suspended structure, such as a ceiling joist or elevated tree limb. In this configuration (not shown), the athlete can be completely suspended from the ground by grasping the handles 142 and will experience 100% of the gravitational forces exerted on the body. By utilizing the portable gym using gravitational forces 100 of the present invention the athlete can strengthen his upper-body muscle groups by performing one-arm pull-ups, two arm pull-ups, and the abdomen and back by performing crunches and leg lifts. Figure 11A-C includes a series of views of the portable gym using gravitational forces 100 of the present invention showing an athlete 200 using the gravity gym 102 attached to a free-standing post 270. As discussed above, gravity gym 102 may be attached to such structures 270 by removing door anchor 110 from clip ring 116, looping leader strap 120 around the structure, and clipping clip ring 116 directly over leader strap 120. During use, the tension applied to leader strap 120 cinches the loop tightly to prevent movement of the strap 120 on the structure. As shown in Figure 11A, athlete 200 is wearing belt harness 104 attached to clip rings 126 at belt rings 176. In this position, the athlete can engage in core strength training exercises, as well as cardiovascular activities, while being restrained by the tension of the portable gravity gym 100.

Figure 11 B depicts athlete 200 engaged in controlled squats utilizing the proper body positioning. Specifically, the most appropriate body positioning for a squat for maximum effectiveness is for the back to be vertically upright, and the hips to be positioned directly over the feet. Unfortunately, this position is nearly impossible to achieve absent support due to the need to balance oneself. Using the portable gym using gravitational forces 100 of the present invention, the athlete can lean forward against the tension of the gravity gym 102 to obtain the proper position. This position can be maintained during the squat exercise as the gravity gym 102 moves with the athlete to provide a constant tension force to belt harness 104.

Figure 11C depicts athlete 200 engaged in lunges during which the athlete jumps upwards from a standing or squatting position (as shown in Figure 11B), to an upwardly outstretched position while maintaining tension on gravity gym 102 and belt harness 104. The combination of exercises shown in Figures 11A-C demonstrate exemplary range of cardiovascular and plyometric body movements that are capable using the portable gym using gravitational forces 100 of the present invention. Notwithstanding the specific exercises described above, in use, the portable gym using gravitational forces 100 of the present invention exercises the entire body with a portable belt harness, pulley and cable system that uses the person's body weight for resistance. As shown, setup is very easy. If an athlete is using a reinforced structure for support, he can simply wrap the adjustment strap around the structure and clip it to itself. Alternatively, if using a doorway for support, he can simply place the door anchor between the door and frame over the top hinge 212 with the large stop 112 behind the door 208 when closed. Attach the adjustment strap to the door anchor. When standing and facing the pulley the athlete presses the adjustment clamp to the desired height position, holds both handles, and extend the arms fully and leans backwards. By adjusting the placement of the feet towards the support, the forces experienced can vary from a little (easy) or a lot (harder) depending on the desired resistance. Exercise can include the athlete pulling the handles together or separately toward the body then slowly extend, lifting the user upright against gravity, and back down to the original position to complete the basic movement. The athlete can then repeat for the number of desired repetitions.

When standing and facing away from the pulley, the athlete presses the adjustment clamp to the desired height position, holds both handles, extends the arms fully and leans forward. By adjusting the placement of the feet towards the support, the forces experiences can vary from a little (easy) or a lot (harder) depending on the desired resistance.

This exercise can include the athlete pulling the handles together or separately away from the body then slowly return, lifting the user upright against gravity, and back down to the original position to complete the basic movement. The athlete can then repeat for the number of desired repetitions.

An alternative exercise may include performing cardiovascular, legs, abs and plyometric movements by attaching the belt harness to the pulley cable and placing the harness around the waist facing forward or backward depending on the preferred exercise.

While there have been shown what are presently considered to be preferred embodiments of the present invention, it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the scope and spirit of the invention.

Claims

1. A portable gym using gravitational forces, comprising: a gravity gym assembly and a belt harness; said gravity gym assembly comprising: a door anchor attachable to any doorway having a door, an adjustable strap that leads to a pulley through which a cable passes, said cable equipped with detachable handles on each end advancable back and forth through the pulley when forces are applied to the handles.