throughout the following detailed description , in the event that similar reference characters are called out , they refer to similar elements in all figures of the drawings . in reference to fig1 there is depicted generally at 100 the preferred embodiment of the invention presented herein configured to accommodate the sitting system apparatus of the present invention . the invention is also configured to accommodate the sitting system apparatus in fig1 in a perspective view . the sitting system apparatus 300 is pivotal and rotatable about pivotal support 60 . the sitting system apparatus 300 , as shown in fig3 is affixed to the seat platform 10 so that an exerciser using the present invention may perform weight resistance training exercises commonly executed with the exerciser in a seated position . referring to fig1 and 10 , the position of the seat platform 10 is typically stationary relative to the resistance arm 30 . typically , the seat platform 10 is placed in a position so that an exerciser sitting upon the pivotal and rotatable sitting system apparatus 300 is able to move the resistance arms 30 throughout the full range of motion of the muscle group ( s ) being exercised . in this way the exerciser is able to gain the most from each performance of the exercised movement . the pivotal sitting system apparatus 300 upon which the exerciser sits pivots on the pivotal support 60 of the sitting system apparatus 300 , thereby compelling the exerciser to use their stabilizing muscles to balance their body relative the weighted resistance of the exercise arms 30 . to completely isolate the exerciser from any stable and non - pivoting support , foot support 130 is attached to the base 12 of the pivotal and rotatable exerciser system of the present invention . the foot support 130 may comprise a single unitary pivotal support capable of supporting both feet of the exerciser or instead two individual foot supports that individually pivot and support each foot of the exerciser . the important feature is that the foot support 130 isolates the exerciser &# 39 ; s feet from the ground or other stable support surfaces . the foot support 130 is also typically adjustable in a manner similar to the sitting system apparatus 300 adjustable pivotal support 60 . a pivotal support 60 depicted in fig3 is typical in structure of the pivotal support 60 throughout the figs . included herein . the pivotal support comprises a ball joint 52 held in place by a double socket arm 54 . the amount of force required to move the ball joint 52 is controlled by the tightening mechanism handle 56 . tightening of the handle 56 tightens the double socket arm 54 about the ball joint 52 thus increasing the amount of force required to move the ball joint 52 held by the double socket arm 54 . in other words , the amount of pivot and rotation of the ball joint ( i . e ., sway ) is controlled by the tightening handle 56 . the tightening mechanism 70 of the pivotal support 60 is shown generally at 70 in fig5 . the tightening mechanism 70 typically comprises a spring - biased handle 56 having a threaded shaft . a spring 74 is fed onto the shaft of the handle 56 and the shaft of the handle 56 is then inserted through holes aligned in the two halves of the double socket arm 54 . a metal washer 66 and a plastic washer 68 are then fed onto the threaded shaft of the handle 56 . a nut 72 is then threaded on the end of the threaded handle 56 so that the tightening of the nut 72 on the shaft of handle 56 tightens the double socket arm as discussed above . in addition to the adjustable sway of the pivotal support 60 , the height of the pivotal support 60 is also adjustable . the height of the pivotal support 60 typically comprises a slide support pipe 62 disposed inside of a support pipe 64 . the overall height of the pivotal support 60 is adjusted by varying the length of the slide pipe 62 extended above and out of the support pipe 64 . the slide pipe 62 may be locked into its desired position relative the support pipe 64 by any number of means commonly understood by those skilled in the art of mechanical devices such as pins , nut and bolt , etc . in reference to fig1 and 10 , the pivotal and rotatable exerciser system 100 of the present invention is stabilized by a weight support structure attached to the center support 2 of the system 100 . the support structure typically comprises vertical supports 16 and 18 , brace 22 and top support 20 . the weight support structure of the invention may take on forms not depicted herein , the present embodiment is not meant to limit the scope of the present invention but merely to illustrate one type of supportive structure contemplated . the critical feature of the weight support structure is that the weight support structure is able to stabilize the pivotal and rotatable exerciser system of the present invention so that the pivotal sitting system apparatus 300 ( or other pivotal apparatus ) and foot support 130 supporting the exerciser are the only pivotal and rotatable exerciser supportive components of the system . the stable support structure of the present invention helps provide the safety inherent in machine - type weight resistance exercise equipment by stabilizing the pivotal and rotatable exerciser system of the present invention . the resistance arms 30 pivot about pivot joint 14 . a detailed depiction of pivot joint 14 is shown fig9 . the weight support structure 20 is pivotally linked to the resistance arms 30 by a bolt and nut 96 . the resistance arms 30 and the support structure 20 are separated by a lubricated washer 92 to allow easy pivoting of the resistance arms 30 . in order to use the present invention embodied in fig1 and 10 , the sitting system apparatus 300 is attached to the sitting platform 10 . the base 50 of the sitting system apparatus 300 is positioned in a recess 110 located on the sitting platform 10 , as depicted in fig1 . the exerciser sits upon the seat 42 , resting their feet on foot support 130 . the exerciser then proceeds to lift the resistance arms 30 to perform the desired exercise by grasping handle 4 . the resistance arms 30 pivot about pivot joint 14 . as the exerciser lifts the weighted resistance via the resistance arms 30 throughout the exercise movement , the exerciser will have to stabilize themselves since the exerciser is totally supported by the pivotal supports 60 of the sitting system apparatus 300 and the foot support 130 . in the preferred embodiment of the invention , plate weights are added to the resistance arms of the invention by placing the plates on plate support post 6 . the amount of weight to be lifted by the exerciser is conveniently added and removed by placing common plate weights on the plate support post 6 . the resistance arms 30 are restricted from lowering below a certain level by a support shelf 8 . the support shelf 8 adds a level of safety to the system since the resistance arms are only allowed to fall so far even if the exerciser loses control of the resistance arms . though a support shelf has been depicted in the preferred embodiment of the present invention , other similar and dissimilar safety features found in machine - type resistance weight training equipment may be incorporated into the invention without departing from the scope of the present invention . additionally , the exerciser may be strapped into the sitting system apparatus 300 via a seat belt 46 for an added level of safety . the seat belt 46 may be latched about the waist of the exerciser by engaging the belt 46 and the latch plate 44 . the chair back 40 is typically adjustable to accommodate the different sizes and preferences of individual exercisers . the chair itself is attached to the pivotal support 60 by a plate 48 having one side attached to the bottom of the chair seat 42 and the other side attached to the ball joint 52 of the pivotal support 60 . fig2 depicts the present invention configured to accommodate a pivotal standing platform generally at 200 . the pivotal standing platform depicted in fig8 is attached to a pivot support base 24 via a pivotal support 60 . the pivot support base 24 is attached to a pivotal support similar to the pivotal support 60 discussed above in relation to the sitting apparatus 300 and depicted in fig3 . the pivot support platform is attached to the center post 2 of the system 200 . the ball joint 88 is received and held by the double socket arm 54 . the pivotal support 60 receiving the ball joint 88 that is attached to the bottom of the standing platform base 86 is further attached to the pivot support base 24 in a recess ( not shown ) in the top of the pivot support base 24 in a manner similar to the sitting apparatus &# 39 ; 300 reception in recess 110 of fig1 . as with the sitting apparatus 300 discussed earlier , the pivotal support 60 supporting the standing platform 24 of the present invention configured for pivotally supporting a standing exerciser is typically pivotally , rotationally and height adjustable . the pivot support 24 is typically adjustable relative to the resistance arms 30 . the adjustable pivot base 24 allows exercisers of different sizes and preferences to use and equally enjoy the benefits of the present invention . an exerciser performing exercise movements requiring the exerciser to stand , stands on the pivotal standing platform attached the pivot support base is 24 . thus , standing the pivotal standing platform the exerciser is isolated from the floor or any other stable support . an exerciser may also use the present invention configured to accommodate exercises in which the exerciser uses a bench as depicted in fig6 and 10 . the fig6 is a plan view of the present invention showing the weight support structure and a bench support apparatus 80 including a pivotally supported bench 82 . the fig7 shows a plan view of the bench support structure 80 and bench 82 only and the fig1 shows a perspective view of the present invention configured to accommodate exercises in which the exerciser uses a pivotally supported bench 82 . in fig6 and 11 , a bench support structure 80 is attached to a support structure base 12 at a position 120 . the position 120 may encompass a cut - out that receives the bench support structure 80 as depicted in fig1 or a weld , clamps or other means for holding the bench support structure in fixed proximity to the weight support structure . the important factor in the attachment of bench support structure 80 to the support structure base 12 is that the bench support structure 80 is held in a stationary position relative to the rest of the invention . the bench 82 is pivotally supported by the pivotal support 60 . the base of the pivotal support 60 attaches the bench support structure 80 and the ball joint end of the pivotal support 60 is attached to the bench 82 . as depicted in the fig6 and fig1 , there is one centrally located pivotal support 60 supporting the bench 82 . although two or more supports could be used to support the bench 82 , the use of one centrally located pivotal support 60 enables the greatest possible amount of pivoting of the bench 82 . also included in the bench configuration of the present invention is a foot support 130 . in the preferred embodiment as depicted in fig1 , the foot support 130 is separated into two individual foot supports . the foot supports 130 here are similar to the foot supports used in the sitting position configuration of the present invention . the foot supports 130 operate to completely isolate the exerciser from the floor or other stable support surface . additionally , a safety belt ( not shown ) may be attached to the bench 82 for securely holding the exerciser to the bench 82 . preferably , the safety belt attached to the bench 82 is adjustable in order to accommodate exercisers of varying sizes and preferences . an exerciser lifting resistance arms 30 does so by grasping and holding handle 4 . the handle 4 of the invention has been depicted in fig1 and 11 as a continuous structure linking one resistance arms 30 to the other . there is no requirement that the resistance arms 30 be linked . instead it is quite feasible , and even desirable in certain circumstances , that each resistance arm 30 is allowed to pivot individually of the other resistance arm 30 . in these circumstances , the handle 4 does not extend from one side of the system to the other side of the invention . while the invention has been described and illustrated with reference to a specific embodiments thereof , it is understood that other embodiments may be resorted to without departing from the invention . therefore the form of the invention set out above should be considered illustrative and not as limiting the scope of the following claims .