space between the foot engagement member portions 126 of the foot pivot structures 108 and reaches forwardly with his hands to grasp the twist grip members 150 initially the exerciser balances on the body rest structure 12 with the front and rear support legs in their straightened essentially vertical orientations depicted in fig5 the exerciser then operates the left foot control means 28 and the left front twist grip 150 as previously described to rearwardly bend and forwardly pivot the left front and rear support legs 16 and 20 as illustrated in fig6 while balancing on the right front and rear support legs 18 and 22 the exerciser then leans forwardly and straightens the left front and rear support legs 16 and 20 to bring the machine 10 to its orientation depicted in fig7 in which the right front and rear support legs 18 and 22 are forwardly tilted at this point the exerciser is again balanced on all four of the support legs next the right hand and foot of the exerciser are used to operate the right twist grip member 150 and the right foot control means 30 to rearwardly bend and forwardly pivot the right front and rear support legs 18 and 22 fig8 while using his left arm and leg to bring the left front and rear support legs 16 and 20 upon which the exerciser is balanced to their essentially vertical positions shown in fig8 finally the exerciser leans forwardly to forwardly tilt the straightened left front and rear support legs 16 and 20 while simultaneously straightening the right front and rear support legs 18.