Patent ID: 7285076

Claim:
An exercise apparatus comprising: a) a frame having a pivot axle; b) a carriage, suspended from the pivot axle for oscillatory motion relative thereto; and c) a motor, adapted to receive at least some of its required input energy in the form of human motion, connected to the frame and the carriage so as to urge the carriage to move relative to the frame, wherein the motor includes: i) an input transducer for receiving energy in the form of human motion; ii) an actuator having a pair of hydraulic cylinders each with a piston and each connected to the frame and carriage, via a fulcrum with one cylinder being disposed on each opposite side of the pivot axle, so as to urge the carriage to move relative to the frame wherein each cylinder is double acting having an extension port and a retraction port; and iii) a hydraulic pump connected to the input transducer, to receive at least some of its required input energy therefrom, and the cylinders to exchange hydraulic fluid therewith whereby hydraulic fluid supplied to the extension port urges the piston to extend from the cylinder and hydraulic fluid supplied to the retraction port urges the piston to retract into the cylinder.