Exercise machine in which the user pushes or pulls against a resisting force produced by a pneumatic cylinder operating in conjunction with compressed air

Claim 1

AN EXERCISE MACHINE COMPRISING A PLATFORM, AN OUTRIGGER POSITIONED AT THE FORWARD END OF THE PLATFORM AND EXTENDING OUTWARDLY THEREFROM, A PULLEY SYSTEM CONNECTED AT EACH END OF THE OUTRIGGER TO THE FORWARD END OF THE PLATFORM, A PNEUMATIC PISTON AND CYLINDER MOUNTED ON SAID PLATFORM, FLUID CONTAINED IN THE CYLINDER ON THE FORWARD SIDE OF SAID PISTON, A FLEXIBLE STRAND MEANS HAVING ITS END REEVED THROUGH THE RESPECTIVE PULLEY SYSTEMS AND CONNECTED TO THE END OF THE PNEUMATIC PISTON FOR MOVING SAID PISTON FORWARDLY, HANDLES SECURED AT EACH END OF THE STRAND, MEANS FOR RESISTING THE FORWARD MOVEMENT OF SAID PISTON INCLUDING AT LEAST ONE TANK WITH A COMPRESSIBLE FLUID THEREIN, A FLUID CONDUIT CONNECTING SAID CYLINDER AND SAID TANK SO THAT SAID PISTON FORWARD MOVEMENT MOVES FLUID TOWARD SAID TANK, AND VALVE MEANS FOR CONTROLLING THE MOVEMENT OF FLUID IN SAID CONDUIT, CYLINDER, AND TANK.