Patent ID: 9707432
Date: 2017-07-18
CPC Classifications: A63B

Claim:
1. An exercise apparatus for performing a back extension exercise by a user having a lower back, legs and a trunk that has a longitudinal trunk axis and a trunk weight, the apparatus comprising: a frame, a seat having a seating surface and a pelvic stabilization pad having a lower back engagement surface, an input arm assembly interconnected by a first interconnection to a first resistance mechanism, the input arm assembly including a manually graspable mechanism and being arranged on the apparatus such that the input arm assembly is pivotable beginning from a start motionless position along a path of travel rearwardly toward the pelvic stabilization pad under resistance exerted by the first resistance mechanism, the seating surface and the pelvic stabilization pad being mounted, adapted and arranged on the frame in a disposition such that the user can simultaneously sit on the seating surface (PS), engage the user's lower back against the lower back engagement surface and manually engage the manually graspable mechanism to pull the input arm assembly against resistance exerted by the first resistance mechanism, wherein the first resistance mechanism is adapted to increase resistance as the degree of pivoting of the input arm assembly increases along the path of travel away from the start motionless position rearwardly toward the pelvic stabilization pad, wherein the input arm assembly is interconnected to the first resistance mechanism by a cable, the arm assembly being interconnected to a cam having a receiving groove that receives the cable, the cam being interconnected to the arm assembly such that the cam rotates together with pivoting of the input arm assembly, the receiving groove having a profile selected to create a lesser torque force against the user's pulling force when the user starts pulling the arm assembly from the start motionless position and gradually increase torque force against the user's pulling force as the user continues to pull the input arm assembly rearwardly.