US20080004166A1

US20080004166A1 - Compact office exercise unit

Info

Publication number: US20080004166A1
Application number: US11/797,090
Authority: US
Inventors: Yarom Oren; Ron Reisman
Original assignee: WORK'N SHAPE Ltd
Current assignee: WORK'N SHAPE Ltd
Priority date: 2006-06-20
Filing date: 2007-04-30
Publication date: 2008-01-03
Also published as: WO2007148333A2; WO2007148333A3

Abstract

According to one aspect of the present invention, there is provided a compact exercise unit, which comprises a body attachable to a standard swivel chair leg in a removable manner. The body has at least one internal cavity and at least one exercise element. The exercise element has a first and a second end, the first end being fixed to the body. The element is extendable between a non-extended position and an extended position in which the second end of the element protrudes from the body. The cavity being adapted at least for storage of said element at least in said non-extended position.

Description

FIELD OF THE INVENTION

This invention relates to a portable full body exercise apparatus, and in particular, to a compact exercise unit attachable to the leg of a standard swivel chair.

BACKGROUND OF THE INVENTION

Recent medical studies have shown that lack of physical activity and exercise may cause a significant decrease in both physical and mental state of the human body and mind, as severe as causing heart attack and cancer. In today's modern day environment, due to considerable lack of time, mainly among office workers, it is difficult to get even the minimum amount of such exercise. In order to take part in physical activity, a worker is either forced to move to a certain designated location within the office compound, specifically adapted for physical activity, or commute to a gym or country club outside his work place. Both options take too much time, as a result of which most people remain in constant lack of physical activity.
In the last few years, increasing awareness and concern for people's health and need of physical exercise have spawned up numerous devices whose sole purpose was to increase “results to time” ratio. However, despite obvious advantages, such devices, much like the devices found in gyms, are usually too big and robust, and take up much space, making them unsuitable for standard size offices. Furthermore, most such devices require a great amount of time for construction and maintenance and are not only space consuming but also hardly transportable in their dismantled form, let alone once assembled.
A number of compact, portable devices have been developed, providing in office and indoor physical activity, usually by attachment of the device to either a desk or a chair. Some examples of such devices are presented below.

- U.S. Pat. No. 6,099,445 discloses an exercise device mounted onto a swivel chair, which comprises a back mechanism of variable height, and a horizontal bar at chair seat height, both for exercising upper body using elastic resistance means, and a front mechanism for training of the legs, using the same kind of resistance.
- US20040053756 discloses an exercise device attached to a swivel chair, consisting of a set of extendable rod housings encompassing a set of cords and pulleys, for exercising of upper and lower body, allowing variable resistance levels.
- U.S. Pat. No. 5,324,243 discloses an exercise apparatus mounted on the back rest of a standard chair, which comprises a bar located in a rotatable hub, and elastic resistance means attached to said bar, for training user's arms.
- U.S. Pat. No. 5,599,260 an exercise device mounted onto the leg of a swivel chair, consisting of a set of pulleys, where ends of said pulleys are attached to elastic resistance means to exercise the arms. In addition, said pulleys comprise a foot brace and are adapted for rolling motion along the floor to exercise the legs.

SUMMARY OF THE INVENTION

According to one aspect of the present invention, there is provided a compact exercise unit, which comprises a body attachable to a standard swivel chair leg in a removable manner, and having at least one internal cavity and at least one exercise element having a first and a second end, said first end being fixed to the body, said element being extendable between a non-extended position and an extended position in which the second end of the element protrudes from the body, said cavity being adapted at least for storage of said element at least in said non-extended position.
According to a second aspect of the present invention there is provided a compact exercise unit attachable to a standard swivel chair leg in a removable manner, which comprises at least one exercise element with a first and a second end, said first end being fixed to the unit, said element being extendable between a non-extended position and an extended position in which a portion thereof including said second end is adapted for rotation about a horizontal rotation axis perpendicular to said chair leg, when said unit is mounted thereon.
The unit according to the second aspect of the invention may have a body as described with respect to the first aspect of the invention. The body in both cases may further comprise one or more compartments adapted for storage of additional exercise elements or any other articles.
The body is designed to at least partially surround the leg, when the unit is mounted thereon. The internal cavity may occupy the majority of the body and may be adapted for mounting the first end of the exercise element therein.
The exercise unit may include more than one exercise element and its internal cavity may be adapted for storing at least two of such elements. The internal cavity may comprise more than one storage compartment, in particular for storing exercise elements therein, and their location may be on the sides of the leg, in front of the leg or behind the leg, when the unit is mounted thereon.
The exercise element in the exercise unit of the first and second aspects of the invention may be of variable length and/or capable of taking different positions, to bring it into at least two different operative states.
The variable length of the exercise element may be achieved by the element being rigid and having a telescopic design, or being elastic, or due to any appropriate design. Different positions of the exercise element may be achieved by its horizontal rotation about a vertical axis parallel to the chair leg, and/or vertical rotation about a horizontal axis perpendicular to said leg. The element may also be designed to allow adjustment of its height and/or distance of its second end from the chair seat, and it may be adapted for at least upper or lower body exercise in sitting position.
The second end of the exercise element may be adapted for mounting further components thereon, which may be in the form of an additional exercise device, a part thereof or a supplement to said exercise element. The supplement may be, for example, in the form of a resistance means such as a spring, elastic cord or the like. The additional element may be adapted for storage within the cavity of said body.
The body of the exercise unit may have a surface area large enough to enable mounting of additional exercise elements thereon. The exercise elements may be of the previously mentioned type, and/or may include handle bars for exercising hands, a stepper, etc. The unit may be further adapted to function as a foot rest and be so mounted on the chair leg as not to interfere with the performance of regular office activity when said element is in its non-extendable position.
The unit may also be adapted to be connected to a computer equipped with appropriate software and programs, allowing the use of features such as a personal trainer, exercise reminder, exercise games and more, in conjunction with said unit, through an interactive computer interface. For that purpose, the unit may also be equipped with sensors being in communication with said interactive computer interface allowing automatic adjustment of personal, per user, settings such as resistance, angle of arms etc. through said computer interface.
The unit may be mounted on said chair leg using various means such as a snapping mechanism, screws, clamping mechanism or the like.
According to a third aspect of the present invention there is provided a compact exercise unit attachable to a standard swivel chair leg in a removable manner, the leg having a predetermined diameter, said unit having a body formed with a longitudinal slot extending perpendicularly to said swivel chair leg, when the unit is mounted thereon, and having a first open end at the circumference of the body, and a second closed end spaced inwardly from said circumference, the width of said slot being not smaller than said predetermined diameter, to allow said slot to receive said leg therein.
The unit further comprises a clamping mechanism for the fixation of the position of the unit relative to said chair leg, in which the leg is located at the closed end of the slot and clamped thereagainst. The clamping mechanism may comprise a first element adapted for horizontal movement along said slot towards said second end of the slot, and a second element adapted for vertical movement, within said slot.
The unit according to the current aspect of the invention may have any feature of the unit according to first and/or second aspects of the invention.
The exercise unit according to any of the above described aspect of the invention may have a design which will advantageously occupy the majority of the vacant space below the seat of a chair corresponding to the area of the chair, with a minimal height along the chair's leg, and will provide a vast variety of exercise opportunities.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to understand the invention and to see how it may be carried out in practice, several embodiments according to various aspects of the present invention will now be described, by way of non-limiting examples only, with reference to the accompanying drawings, in which:
FIG. 1A is an isometric view of an exercise unit according to one embodiment of the present invention, wherein exercise elements are in an extended position;
FIG. 1B is an isometric view of the exercise unit of FIG. 1A with a top cover thereof being removed;
FIG. 1C is an isometric view of the exercise unit of FIG. 1A when mounted on a chair;
FIG. 2A is an isometric view of the exercise unit of FIG. 1A with the exercise elements in a non-extended position;
FIG. 2B is an isometric view of the exercise unit of FIG. 2A with the top cover removed;
FIG. 2C is an isometric view of the exercise unit of FIG. 2A when mounted on a chair;
FIG. 3A is an isometric view of the exercise unit shown in FIGS. 1A to 2C, with front storage compartment removed;
FIG. 3B is a schematic isometric view of the exercise unit shown in FIGS. 1A to 2C, mounted on a chair, with all parts, except the base plate and clamping mechanism, being removed;
FIG. 4 is an isometric view of a spool used as resistance means in the exercise unit shown in FIGS. 1A to 2C;
FIG. 5A is an isometric view of one operative state of the exercise unit shown in FIGS. 1A to 2C;
FIG. 5B is an isometric view of another operative state of the exercise unit shown in FIG. 5A;
FIG. 6A is an isometric view of the exercise unit shown in FIGS. 1A to 2C with an additional stepper added thereto;
FIG. 6B is an isometric view of the exercise unit shown in FIG. 6A, when mounted onto a chair;
FIG. 7A is an isometric view of an exercise unit according to another embodiment of the present invention;
FIG. 7B is an isometric view of the exercise unit shown in FIG. 7A, when mounted onto a chair;
FIG. 8 shows an alternative spool which may be mounted, instead of the spool shown in FIG. 4, onto the exercise elements of the exercise unit shown in FIGS. 1-7;
FIGS. 9A to 9N illustrate different types of exercises which may be performed by means of the exercise unit shown in FIGS. 1 to 8;
FIG. 10A is an isometric view of an exercise unit according to another embodiment of the present invention, wherein exercise elements are in an extended position;
FIG. 10B is an isometric view of the exercise unit of FIG. 10A with a top cover thereof being removed;
FIG. 11A is an isometric view of the exercise unit of FIG. 10A in a non-extended position, with the top cover removed and side storage compartments extended;
FIG. 11B is a schematic isometric view of the exercise unit shown in FIG. 11A, with all parts, except the base plate, clamping mechanism, and wing elements being removed;
FIG. 12A is a rear isometric view of the exercise unit in FIG. 10A, with the adjustment lever and utility cover in a closed position;
FIG. 12B is a rear isometric view of the exercise unit in FIG. 10A, with the lever and cover of the positioning mechanism in an open position; and
FIG. 13 is a rear isometric view of the exercise unit in FIG. 10A, in a non-extended position.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

FIG. 1A and FIG. 1B illustrate a compact exercise unit 10 according to one embodiment of the present invention, which is adapted for mounting on a leg of a swivel chair as shown in FIG. 1C.
The exercise unit 10 comprises a body 50, two extendable front arms 20, two extendable rear arms 30, an extendable upper bar 40 and four spools 60 mounted on the arms and the bar.
The body 50 comprises a base plate 51 and a top cover 52 with a cavity 53 defined therebetween. The body has an axis of symmetry 100 and has a dimension in a plane perpendicular to the axis of symmetry 100, essentially greater than the distance between the upper and lower plates.
The base plate 51 and top cover 52 both have aligned narrow longitudinal slots 54, extending from the center of the body 50 towards its circumference. Housed therebetween is a clamping mechanism 55 adapted for mounting the exercise unit 10 onto a leg of the swivel chair (FIG. 1C), so that the body 50 surrounds the leg, and fixes the unit into place. In addition, the body 50 comprises a front storage compartment 56 and two side storage compartments 57. The compartments are adapted for accommodating various exercise elements such as elastic cords, etc. but may also be used for storage of various artifacts. The side compartments 57 may be modified to be hold additional apparatus as will be explained later on.
The two front arms 20 are connected to the back of the body 50, each arm 20 having a hinge 25 allowing it to rotate horizontally and thereby to protrude from the body 50. Each arm has a telescopic design allowing its longitudinal extension. Each arm 20 is comprised of three segments: a first internal 22 a, an intermediate 22 b, and an external 22 c. The first internal segment 22 a is formed with a compartment 23 of a third partially circular form, adapted to be flush against the rims 51′ and 52′ of the base plate 51 and top cover 52 when the arms 20 are in a position parallel to each other. The third external segment 22 c of each arm 20 may be adapted for mounting thereon a resistance means in the form of a spool 60 or the like, which will be defined in more detail later with reference to FIGS. 4 and 8. The compartment 23 may be used for storage of various artifacts.
The two rear telescopic arms 30 each comprises one internal segment 31 fixed to the body 5, one intermediate segment 32 horizontally movable with respect to the internal segment 31, and three segments 33 a; 33 b; 33 c, constituting a telescopic end section 33 connected to the segment 32 by means of a joint 35. The joint 35 is adapted to allow vertical rotation of the end section 33 of each arm about a horizontal axis 36 and is capable of sliding in and out of the segment 32 along with the end section 33.
The upper bar 40 is attached to the segments 32 c of the rear arms 30 and it comprises a longitudinal horizontal bridge 42 accommodating two horizontal back bars 44 adapted to be laterally extended outside the bridge, along its longitudinal direction. Each of the back bars 42 is adapted for mounting thereon a resistance means in the form of a spool 60 similar to the one mounted on the front arms 20.
FIG. 1C shows the exercise unit 10, in its one operative state, mounted on a leg 72 of a standard swivel chair 70, such that the leg 72 is inserted into the longitudinal slot 54 of the body 50 and clamped into place using the clamping mechanism 55 as will be described in more detail below with reference to FIG. 3. In FIG. 1C, one operative state of the unit 10 is shown, wherein the front arms 20 are extended both longitudinally and angularly to create a 120° angle between them. The rear arms 30 are also extended longitudinally and their end section 33 is tilted at 90° with respect to the intermediate segment 31.
FIG. 5A and FIG. 5B show two additional operative states of the unit 10 wherein the angle between the front arms 20 is 0° and 60° respectively. It should be noted that a vast number of operative states is available to the user through various angles between the front arms 20. In addition, although not shown, the back arms 30 may also tilt in various angles to provide additional operative states. Furthermore, the length of each of the arms 20; 30 and bars 44 may be adjusted for the convenience of the user.
FIG. 4 shows the spool 60 used as resistance means in the exercise unit 10. The spool 60 comprises a round housing 61 with discs 62 on both ends. The housing further comprises an inner rod (not shown) and a slot 63. An elastic strap 64 adapted for exercise is wound around the rod within the housing 61 and its tip comes out of the slot 63. A tab 65 is connected to the tip of the strap 64 and has a hole 66 in its center. A ring 67 is passed through the hole 66 and connects the tab 65 to a handle comprising a band 68 and a hand grip 69. The spool is also connected to a connector 161 having a hole 162 adapted to connect the spool 60 to either the front arms 20 or the back bars 44. In operation, pulling on the handle stretches the elastic strap 64, allowing physical exercise. It should be clear that the spool 60 may have any other design known in the art.
In operation, the chair occupant is seated on the seat 74 and may use each one of the four spools 60 to perform either upper or lower body exercise by pulling on the straps 64 using the hand grips 69 with either hands or legs. The structure of the exercise unit 10 allows the user a wide variety of exercises, for example, pulling on the straps 64 either above the back rest 76 or from its sides, with the exercise elements being either in.
The exercise elements of the unit 10 are easily retractable into their inoperative, non-extended position as shown in FIGS. 2A and 2B.
In particular, the back bars 44 are adapted to be retracted into the bridge 42, whereas the rear arms 30 including the upper bar 40, and the front arms 20 are adapted to be retracted into the cavity 53 of the body 50 with the circular portion of the compartment 23 of each of the front arms 20 being flush against the circumference of the base plate 51 and top cover 52. The spools 60 are removed from the front arms 20 to be stored in the front storage compartment 56. The spools 60 connected to the back bars 44 may be left slightly protruding from the body 50 of the exercise unit 10, or alternatively they may also be removed and stored away, e.g. in the side storage compartments 57.
FIG. 2C shows the exercise unit 10 in a non-extended position mounted on a chair 70. In this position, the unit 10 does not protrude outside the circumference of the seat 76 of the chair 70, thus on the one hand allowing performance of regular office activity, and on the other hand efficiently utilizing the space under the chair 70 for storing its exercise elements. The unit 10 may also function in this position as a foot rest.
It should be noted that the unit 10 may be used for exercise in a non-extended position since the spools 60 may be available to the user, if not removed from the arms, even when the front arms 20 and the back arms 30 are retracted into the cavity 53.
FIG. 3A shows an isometric view of the exercise unit shown in FIGS. 1A to 2C, with the front storage compartment 56 removed and FIG. 3B shows a schematic isometric view of the exercise unit shown in FIGS. 1A to 2C, mounted on a chair, with all parts, except the base plate and clamping mechanism, being removed. In both figures, the clamping mechanism 55 comprising a moving jaw 55 a having a semi circular recess 58 adapted to press against the chair leg 72 (as seen in FIG. 3B) in order to clamp it against the semi circular end of the longitudinal slot 54, a fixed jaw 55 b with a threaded hole, and a lead bolt 55 c going therethrough, connected to the moving jaw 55 a.
During assembly, in order to mount the body 50 on the chair leg 72, the front storage 65, and the clamping mechanism 55 are first removed. The chair leg 72 is inserted into the slot 54 at its open end and is moved towards the closed end of the slot 54 until it abuts it. The moving jaw 55 a is then inserted between the base plate 51 and the top cover 52 and is driven along the slot 54 until it engages the chair leg 72. Once the moving jaw 55 a has engaged the leg, the fixed jaw 55 b is inserted between the base plate 51 and the top cover, and is driven along the slot 54 until it enters vertically into the recesses of the base plate 51 in a direction perpendicular to the slot 54. The lead bolt 55 c is then driven through the threaded hole of the fixed jaw 55 b. When the bolt 55 c is turned, it moves forward, and since the jaw 55 b is fixed, the end result is displacement of the moving jaw 55 a towards the chair leg 72. The bolt 55 c is turned until the unit 10 is secured to the chair leg 72.
Thus, after assembly, the clamping mechanism 55 is located between the base plate 51 and the top cover 25 of the unit 10 (shown here with the front storage space 56 removed) securely clamping the chair leg 72, and the fixed jaw 55 b is positioned in recesses 59 in the base plate 51.
FIG. 6A and FIG. 6B show the exercise unit 10 wherein a stepper 80 is mounted on the front arms 20, as an additional exercise element. In this case, the spools (not shown) are removed from the front arms 20 and instead, the stepper is slipped onto the arms 20.
The stepper 80 comprises two bars 82 connected to a stepper bridge 84, to which levers 86 are connected on each side. Each lever 86 is connected to the bridge 84 on one end of the lever 86 and supports a stepper pad 88 located at the other end of the lever 86.
In operation, the chair occupant is seated on the seat 72 and places his feet on the stepper pads 88. In this position it is then possible to perform several exercises for the leg, which may, among other things, simulate riding a bicycle.
FIG. 7A and FIG. 7B show another embodiment of the exercise unit 10 wherein the side storage compartments 57 have been modified to allow connection thereto of an additional exercise element such as a skiing-type apparatus 90. The skiing-type apparatus 90 comprises two ski bars 92 with bar grips 94 at one end, the ski bars 92 being connected to the body 50 on the other end using a connector 96.
In operation, the user seated in the chair 70, may exercise his upper body by moving the ski bars with his hands, simulating various sport activities, mainly skiing and rowing.
FIG. 8 shows a variation 260 of the spool previously described. The spool 260 comprises a housing 261 with an inner rod (not shown) and a slot 263. An elastic strap 264 is wound around the inner rod and its slip comes out of the slot 263. A tab 265 is connected to the slip and has a hole 266 in its center. On the opposite side of the spool, a band 268 is attached connected to a hand grip 269. The spool additionally has a lock button 262 adapted to adjust the length of the strap 264. The spool 260 may be further used independently to perform various exercises, wherein the spool 260 may be connected to a desk, a door etc. The spool 260 may even be connected to another hand grip 269 to be used to exercise upper or lower body without the need for an object allowing attachment of the spool 260 thereto.
With reference to FIGS. 9A to 9N, different types of exercises may be performed by means of the exercise unit described above. In particular:
Chest and shoulder exercises (as shown in FIG. 9A to 9C);
Arms and Biceps exercises (as shown in FIGS. 9D and 9E);
Diagonal muscle exercises (as shown in FIG. 9F);
Shoulder and back exercises (as shown in FIG. 9G);
Back arm and shoulder exercises (as shown in FIG. 9H);
Arm, shoulder and chest exercises (as shown in FIGS. 9I and 9J);
Back, stomach and shoulder exercises (as shown in FIGS. 9K and 9L);
Side and hips exercises (as shown in FIG. 9M); and
Stomach exercises (as shown in FIG. 9N).
FIGS. 10 to 13 illustrate a compact exercise unit 10 according to another embodiment of the present invention, which is adapted for mounting on a leg of a swivel chair.
The exercise unit 101 comprises a body 500, two extendable arms 200, and spools 60 mounted on the arms. The body 500 comprises a base plate 510 and a top cover 520 with a cavity 530 defined therebetween. The body has an axis of symmetry 1000 and has a dimension in a plane perpendicular to the axis of symmetry, essentially greater than the distance between the upper and lower plates.
The exercise unit 101 is essentially similar to the exercise unit 10 according to the previously described embodiment, with the exception that it comprises only two arms 200, as opposed to two front arms 20 and two back arms 30 in the previous embodiment.
Each arm 200 is connected to a wing element 300 of partially circular form, which is connected in turn to the back of the body 500 via a hinge defining a vertical axis 350 allowing it to rotate horizontally and thereby to protrude from the body 500. The wing element 300 is formed with a side compartment 310 of a partially circular form, adapted to be flush against the rims 312 and 314 of the wing element 300 when in a closed position. The side compartment 310 may be used for storage of various artifacts.
Each arm 200 is connected to the wing element 300 through a hinge defining a horizontal axis 250, allowing the arm 200 to rotate vertically about the axis. Each arm 200 has a telescopic design allowing its longitudinal extension and is comprised of three segments: a first internal 210, connected to the wing 300, an intermediate 220, and an external 230. The third external segment 230 of each arm 200 may be adapted for mounting thereon a resistance means in the form of a spool 60 or the like, as previously defined in more detail with reference to FIGS. 4 and 8.
Referring to FIG. 10B, the wing elements 300 are connected to each other via a gear mechanism 400, comprising a set of two discs 410 with interlocking teeth 415. The disc 410 and the wing element 300 rotate about the same vertical axis 350. The discs 410 may be fixed in a certain position as will be explained later. The rotation of the wing elements 300 about their vertical axis 350, along with the vertical rotation of the arms 200 about their horizontal axis 250, allows the arms 200 to be positioned at almost any angle with respect to the occupant of the chair 70.
Referring to FIG. 11A, the side compartments 310 are in an extended position, and protrude from the body 500 of the exercise unit 101. The compartments rotate about the horizontal axis 315. The clamping mechanism 550 now comprises a moving jaw 552, a fixed jaw 554, a back support 556 and a lead bold 558. The operation of the clamping mechanism 550 is essentially the same as the clamping mechanism 55 according to the previous embodiments of the present invention.
The discs 420 are fixed by pins 436, preventing them from rotating, thus keeping the arms 200 at a fixed position. The lever 430 is now at a raised position, supporting the pins 436.
With reference to FIG. 11B, the positioning mechanism 430 is shown comprising a lever 432, an end plate 433 at its one end, the lever being formed with a major indent 434 a and a minor indent 434 b, the use of which will be explained in detail later. The lever 430 further comprises two pin housings 435, in which two positioning pins 436 are positioned. The lever 430 is formed with a horizontal member 437 at its other end, adapted to support the two housings 435. The positioning pins 436 are adapted to pass through holes 420 of the discs 410 (visible in FIG. 11A) into the housings 435, thus preventing the discs from rotating. The wing elements 300 are positioned on two plate members 330, connected to the base plate 510.
Referring now to FIG. 12A, the latch 439 of the cover 438 is positioned in the minor indent 434 b of the lever 432. In this position, the horizontal member 437 is raised, causing the housings 435 to push the positioning pins 436 in an upwards direction, so that they fit into the holes 420 of the discs 410 (shown previous Figs.).
When the cover 438 is in an open position (FIG. 12B), the latch 439 displaces into the major indent 434 a, thus pushing the lever 432 in a downwards direction, subsequently causing the horizontal member 437 to move in the same direction, lowering the housings 435 and positioning pins 436. This allows rotation of the discs 410, and their re-positioning at a desired angle.
FIG. 13 shows the exercise unit 101 in a non-extended position. The cover 438 is lowered to a closed position, and the arms 200 are stored within the cavity 530 of the body 500.
It should be appreciated that mounting of the unit, as well as all the additional exercise elements, and exercises as specified for the exercise unit 10 as described according to the previous embodiment of the present invention apply to the exercise unit 101 as described with regards to the present embodiment as well.
Those skilled in the art to which this invention pertains will readily appreciate that numerous changes, variations and modifications can be made without departing from the scope of the invention mutatis mutandis.

Claims

1. A compact exercise unit which comprises a body attachable to a standard swivel chair leg in a removable manner, and having at least one internal cavity and at least one exercise element having a first and a second end, said first end being fixed to the unit, said element being extendable between a non-extended position and an extended position in which the second end of the element protrudes from the body, said cavity being adapted at least for storage of said element at least in said non-extended position.

2. A unit according to claim 1, wherein said element is extendable into at least two different extended positions defining two different operative states of said unit.

3. A unit according to claim 1, wherein said body has an external surface and said cavity comprises at least a first compartment adapted for the storage of said exercise element, and wherein at least one of said external surface and said cavity further comprises a second compartment adapted for storage of at least one additional object.

4. A unit according to claim 3, wherein said additional object is an additional exercise unit, a part thereof, or a supplement to said exercise element.

5. A unit according claim 1, wherein said element is of variable length.

6. A unit according to claim 5, wherein said element is telescopic.

7. A unit according to claim 1, wherein said element, when said unit is mounted on said chair leg, is adapted for rotation about a vertical rotation axis, which is parallel to said swivel chair leg.

8. A unit according to claim 1, wherein said element has, when extended, a protruding portion including said second end, which is adapted for rotation about a horizontal rotation axis, perpendicular to said leg when said unit is mounted thereon.

9. A unit according to claim 8, wherein said protruding portion has an adjustable height and length.

10. A unit according to claim 1, wherein the second end of said element is adapted for mounting thereon an additional exercise device, a part thereof, or a supplement to said exercise element.

11. A unit according to claim 10, wherein said supplement is a resistance means.

12. A unit according to claim 1, further adapted to function as a foot rest.

13. A unit according to claim 1, further adapted to be so mounted on said leg as not to interfere with the performance of regular office activity, when said element is in its non-extended position.

14. A unit according to claim 1, allowing the use of said element for at least one of upper and lower body exercises by chair occupant in sitting position.

15. A unit according to claim 1, wherein said chair leg has a predetermined diameter and said body is formed with a longitudinal slot extending perpendicularly to said swivel chair leg, when the unit is mounted thereon, and having a first open end at the circumference of the body, and a second closed end spaced inwardly from said circumference, the width of said slot being not smaller than said predetermined diameter.

16. A unit according to claim 15, further comprising a clamping mechanism for the fixation of the position of said unit relative to said leg, with the leg being located at said closed end of the slot, by clamping said leg against second, closed end of said unit.

17. A unit according to claim 16, wherein said clamping mechanism comprises a first element adapted for horizontal movement along said slot towards said second end of the slot, and a second element adapted for vertical movement, within said slot.

18. A unit according to claim 1, wherein said chair leg has a non-rotational part and said unit is adapted for mounting to said part to avoid rotation of said unit when the chair is rotated.

19. A unit according to claim 1, wherein said unit has an external surface and is of such dimension as to allow mounting thereon of an additional exercise device, a part thereof, or a supplement to said exercise element.

20. A unit according to claim 1, wherein said unit is adapted for connection to a computer equipped with appropriate software and programs, allowing the use of features such as a personal trainer, exercise reminder, exercise games or the like, in conjunction with said unit, through an interactive computer interface.

21. A compact exercise unit attachable to a standard swivel chair leg in a removable manner, the leg having a predetermined diameter, said unit having a body formed with a longitudinal slot extending perpendicularly to said swivel chair leg, when the unit is mounted thereon, and having a first open end at the circumference of the body, and a second closed end spaced inwardly from said circumference, the width of said slot being not smaller than said predetermined diameter.

22. A unit according to claim 21, further comprising a clamping mechanism for the fixation of the position of said unit relative to said leg, with the leg being located at said closed end of the slot, by clamping said leg against second, closed end of said unit.

23. A unit according to claim 22, wherein said clamping mechanism comprises a first element adapted for horizontal movement along said slot towards said second end of the slot, and a second element adapted for vertical movement, within said slot.

24. A unit according to claim 21, wherein said unit is adapted for connection to a computer equipped with appropriate software and programs, allowing the use of features such as a personal trainer, exercise reminder, exercise games or the like, in conjunction with said unit, through an interactive computer interface.

25. A compact exercise unit attachable to a standard swivel chair leg in a removable manner, which comprises at least one exercise element with a first and a second end, said first end being fixed to the unit, said element being extendable between a non-extended position and an extended position in which a portion thereof including said second end is adapted for rotation about a horizontal rotation axis perpendicular to said leg when said unit is mounted thereon.

26. A unit according to claim 25, wherein said element is of variable length.

27. A unit according to claim 26, wherein said element is telescopic.

28. A unit according to claim 25, wherein said element has, when extended, a protruding portion including said second end, which is adapted for rotation about a horizontal rotation axis, perpendicular to said leg when said unit is mounted thereon.

29. A unit according to claim 28, wherein said protruding portion has an adjustable height and length.

30. A unit according to claim 25, wherein the second end of said element is adapted for mounting thereon an additional exercise device, a part thereof, or a supplement to said exercise element.

31. A unit according to claim 25, wherein said unit is adapted for connection to a computer equipped with appropriate software and programs, allowing the use of features such as a personal trainer, exercise reminder, exercise games or the like, in conjunction with said unit, through an interactive computer interface.