An exercise apparatus for performing a back extension exercise comprising: a frame, a seat having a seating surface (PS) and a pelvic stabilization pad having a lower back engagement surface (ES), 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 forwardly away from the pelvic stabilization pad under resistance exerted by one or both of the resistance mechanisms, 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 forwardly away from the pelvic stabilization pad.