which it is entrained over a fixed horizontal pulley 54 mounted to the mobile carriage 80 further both ends of the cord 62 are extended through a fixed vertical double pulley 56 mounted on top of adjustable leg and extended through a pair of fixed vertical pulley 58 mounted in each adjustable upright corner posts 52 each end of the cord 62 is connected to the pair of cord hooks 64 which are connected to the pair of straps 66 which are further connected to the pair of handles 68 by way of example the cord 62 can be yacht braid cord the handles 68 can be wood rings used in gymnastics and the straps 64 can be fabricated from industrial grade nylon the pulleys 54 56 and 58 can be harken pulleys the third major embodiment is the 34 mobile carriage 34 80 as viewed in fig8 amp 13 as illustrated in fig8 and 9 the mobile carriage 80 includes a flat padded platform 82 and two identical padded back support extensions 98 and 100 connected to each end of the undercarriage frame 84 the undercarriage frame 84 is composed of a pair of top support beams 84a a pair of end support beams 84b and a pair of bottom support beams 84c interconnected by welding the undercarriage frame 84 is made from structural grade aluminum and the flat padded platform 82 is preferably constructed of hard plywood connected to the undercarriage frame 84 by a set of detachable fasteners 86 as viewed in fig1 the padding on the platform 82 is fabricated of high density foam the mobile carriage 80 further includes a set of wheels 88 mounted by axles 90 and detachable fasteners 114 to the undercarriage frame 84 adjacent the left.