as illustrated in fig1 , an exercise device 10 according to the present invention is composed in the embodiment illustrated of at least two tubular members , including an inner tube 12 and an outer tube 14 . the tubular members are constructed of a material of suitable strength , for example plastic , metal , synthetic resin , or suitable composite fiber . outer tube 14 has an outer end 16 , an open inner end 11 , and a hollow interior chamber 20 extending within interior of the tubing . inner tube 12 has an outer end 22 , an inner end 24 , and is of an outer smaller than the inner diameter of outer tube 14 . thus the inner end 24 of inner tube 12 is fitted into , and can be moved within , outer tube 14 in a telescoping manner . a collar 17 is provided on the tube 14 at its outer end 16 to receive the tube 12 . the collar 17 allows sliding movement of the tube 12 within the interior of tube 14 . a raised limit stop rim or shoulder 12 a is provided to retain the collar 17 on the tube 12 . the collar 17 serves several purposes . the collar 17 serves to receive and restrain the end 22 of tube 12 from easily pulling apart from tube 14 . the collar 17 also serves as an insertion guide when tubes 12 and 14 are being fitted together . further , the inner diameter of collar 17 and relative clearance between collar 17 and inner tube 12 govern the amount of air pressure or relative vacuum in the interior chamber 20 . the collar 17 by governing the amount of air pressure and relative vacuum governs the amount of resistance exerted in telescoping movement of the device . the collar 17 may also be made in adjustable form to adjust the amount of air pressure and relative vacuum to vary the amount of such resistance . for example , the collar 17 may be in the form of a first threaded male part mounted on top of the outer tube 14 , with a second part threadedly attached thereto . the inner tube 12 loosely fits within the collar 17 . a washer of resilient material such as rubber is mounted between the two threadedly connected parts of the collar 17 . the two threaded parts of the collar when moved together expand the washer inwardly , restricting the amount of air flow between tubes 12 and 14 , and also affording resistance to telescoping movement of the tubes 12 and 14 once frictional contact is achieved between the washer and inner tube 12 . the length of hollow chamber 20 within tube 14 is defined on one end by closed or sealed outer end 16 of outer tube 14 and on the other end by the inner end 24 of inner tube 12 . thus , the length of hollow chamber 20 changes as a user moves inner tube 12 telescopically within outer tube 14 during exercise . hollow chamber 20 holds compressible air that provides resistance to the movement of a user during exercise . the air is drawn in from the surrounding atmosphere during use of the device 10 . as shown in fig2 , the concealed inner end 24 of inner tube 12 is a hollow tubular opening provided with an end cap 26 . the cap 26 is a generally spool - shaped structure having an inner rim or shoulder 26 a adjacent the opening 24 of tube 12 , a central shaft 26 b and an outer rim or shoulder 26 c . the end cap 26 may be attached to the tube 12 by any suitable conventional technique . in one embodiment , the cap 26 has an inward portion ( not shown ) extending from inner rim 26 a and fitted into the end 24 . the tube 12 is then fitted onto the inward portion . the end cap 26 and its inner rim 26 a thus serve to close the inner tube 12 at its concealed inner end 24 . if desired , the central shaft 26 b can be eccentrically located so that the tubes 12 and 14 can be locked together at a particular extended length by relative rotational movement between them . the end cap 26 is further provided with a gasket or ring 28 mounted around the circumferential extent of outer rim 26 c to allow reciprocal sliding movement of the inner end 24 of inner tube 12 within the interior 20 of tube 14 adjacent an inner wall 14 a . the gasket or ring 28 of cap 26 does not , however , provide a hermetic or airtight seal against escape of air from within interior 20 of tube 14 into the atmosphere . rather , small amounts of such air are allowed to pass by the ring 28 but at a rate that is less than the volume or amount of compression by the inner tube 12 during its movement inwardly into the outer tube 14 . in this manner , a resistive force is exerted on the air within interior 20 of outer tube 14 as it is being compressed by inward movement of the tube 12 . after the completion of an inward stroke of the tube 12 into the tube 14 , a replacement volume of air is drawn past collar 17 into the interior 20 of tube 14 as a user expands or elongates device 10 by pulling inner tube 12 telescopically outwardly from outer tube 14 . the air is drawn into hollow chamber 20 past the gasket or seal 28 on cap 26 . the indrawn air fills the volume of hollow chamber 20 as the volume of the chamber expands while tube 12 moves outwardly . cap 26 blocks open inner end 18 of outer tube 14 to prevent the drawn - in air from escaping hollow chamber 20 into the interior of tube 12 . on the next compression cycle , as a user contracts device 10 by pushing inner tube 12 telescopically into outer tube 14 , the air contained in hollow chamber 20 is compressed and only small portions escape from chamber 20 , thus providing resistance from device 10 to muscle movement by a user . as illustrated in fig3 , a stretchable resistance band 30 can be attached to exercise device 10 to provide additional resistance to a user during expansion movement . resistance band 30 is stretched as a user slides inner tube 12 telescopically out from within outer tube 14 . resistance band 30 then contracts as a user slides inner tube 12 telescopically into outer tube 14 . in fig3 , stretchable band 30 is shown connected to the outside of device 10 ; however , stretchable band 30 can also be located in hollow chamber 20 inside of outer tubing 14 , so that it does not interfere with user during exercising . there is a gripping area 32 on at least one of outer ends 16 , 22 of the tubing material for a user to grasp with his or her hand while using device 10 . fig1 shows gripping area 32 on inner tube 12 , but it can be located on either inner tube 12 or outer tube 14 . gripping area 32 can consist of the bare outer surface of the tubing . if desired , the tubing surface in the location of gripping area 32 could be modified or adapted to provide a better gripping surface for a user . for example , knurls ( not shown ) or crenellations ( not shown ) could be added to an exterior area of the bare surface of the tubing adequate for grip by a user &# 39 ; s hand . as illustrated in fig3 , a grip member 34 , such as a cap , cover , sleeve , or other outer covering can also be provided at gripping area 32 to protectively cover the tubing material and to facilitate more comfortable gripping of the exercise device 10 by a user . a lower limb connector attachment in the form of a connecting strap 36 is provided on the exercise device 10 at an opposite end from the gripping area 32 . thus , the opposite one of outer ends 16 , 22 of the tubular member from gripping area 32 , as shown on outer end 16 in fig1 , has the connecting strap 36 mounted with it . the strap 36 may be a unitary band , or a closable loop as shown closed by a buckle 36 a or other suitable connector or closure structure . connecting strap 36 is made of a flexible material of suitable strength that allows for firm but gripping attachment to a limb of a user , preferably a lower limb such as the leg , ankle or foot . the flexible material of the strap 36 may be resilient , or elastic , if desired . it should be understood that the lower limb connector attachment of the preferred embodiment may take the form of various modifications or supplements to the strap 36 . for example , the strap 36 may be modified by addition of material to take the form of a boot , shoe , or other form of foot covering . the strap 36 alternatively may be replaced by such a detachable boot , shoe or other foot covering . it is preferable , however , that the connector attachment maintain firm but gripping attachment to the lower limb of the user . the connecting strap 36 of the connector attachment is typically about one or two inches in width and may be attached to the device 10 by any number of alternative arrangements . for example , the connecting strap 36 may be mounted directly or by a connector ( as shown in fig1 ) extending through an eyelet or port 37 a of a socket or cap 37 fitted over the end 16 of tube 14 . the cap 37 serves to close or seal end 16 of tube 14 . alternatively , the connecting strap 36 may be formed as an integral part of the cap 37 , or the strap 36 may be glued to cap 37 or attached by snaps , velcro straps or a number of other suitable forms of connectors . fig3 shows connecting strap 36 attached to a foot ( shown schematically in phantom at f ) of a user . strap 36 allows for cushioned migration across the foot as a user moves device 10 in various directions while exercising . connecting strap 36 can be wrapped around a limb and fastened with velcro , or else it could have a noose that can be tightened and adjusted to provide a secure attachment , so that strap 36 does not slip off of a user &# 39 ; s limb during exercise . the fit of strap 36 should be secure , but not so rigid or tight as to possibly cause pain or injury to a user . it is to be noted that the strap 36 permits users to affix the device to their body at a selected portion of a limb , either an arm or leg , depending on the selected full body workout . the resilience or elasticity of the strap 36 causes the device 10 to remain engaged with the user &# 39 ; s limb . thus the device 10 is not as likely to slip or become disengaged , as would be the case if an exercise of earlier types with handgrips at each end were used . if desired , a conventional counting mechanism 38 could be attached such as on collar 17 to exercise device 10 to sense relative movement of the two tubular members 12 and 14 and count or tally the number of repetitions of telescopic movement of inner tube 12 and outer tube 14 . counting mechanism 38 could also be used to provide a signal or other indication at the end of a preselected number of repetitions . fig4 , 5 and 6 show a user performing a variety of full body workout exercises with device 10 . by grasping gripping area 32 with a hand and securing connecting strap 36 to a foot , users can expand and contract the device 10 by moving the tubes 12 and 14 in and out with respect to each other in while moving their body in a variety of directions . further , the flexible material of strap 36 allows the strap to yield and conform to the shape of the point of attachment or connection to the user &# 39 ; s body , whether the foot or other body portion of the user . thus , as the user moves to various body positions ( fig4 , 5 , and 6 ) during a full body workout with the device 10 of the present invention , the resistive forces of the device are maintained and applied to the user &# 39 ; s body muscles . exercises can be performed using one device 10 , as shown in fig4 , or with multiple devices 10 , as shown in fig5 . fig6 shows a stretchable connecting band 40 attached between two of the devices 10 , to provide resistance when a user pulls the devices 10 apart from one another . it can thus be seen that the exercise device 10 permits a user to perform a full body workout according to the present invention . the user may perform movements , working against resistive forces offered by the device 10 to stretch and strengthen muscles in the arms , legs and upper and lower torso at the same time . by connection the device at the user &# 39 ; s hand with handgrip area 32 and to the user &# 39 ; s foot or leg at the connecting strap 36 , various particular portions of the user &# 39 ; s musculature may be selectively chosen and subjected to exercise for a selected number of repetitions or for a chosen length of time . it should be noted and understood that there can be improvements and modifications made of the present invention described in detail above without departing from the spirit or scope of the invention as set forth in the accompanying claims .
an exercise device is provided for enabling a user to obtain a full body workout . by attaching the device at selected positions on the hands , feet , arms , legs , or torso , different muscle groups of a user &# 39 ; s body can be isolated for training and strengthening purposes . the exercise device includes two or more pieces of tubing material fitted together in a telescoping manner . pressurized air within the tubing provides a user with resistance to movement in order to tone and strengthen the muscles . at one end of the telescoping tubing material is a handgrip and at the other end is a strap of a suitable resilient or elastic material that allows a user to securely place a foot or hand in for exercise purposes .