When youíre ready to build muscular legs and stronger knee joints, the Leg Extension Machine is ready to help you meet your goals. Itís a sleek, smooth machine that rivals far more expensive machines. The exceptionally strong mainframe combined with a specially contoured DuraFirmô thigh pad and biomechanically exact movement pattern provide a smooth, solid feel and immediate response. Precise pivot point alignment and center-drive, variable resistance cam design deliver the smooth and powerful response you expect. Recumbent DuraFirmô back pad adjusts for all-size users and eliminates lower back strain while allowing full range-of-motion. Pop pin adjustable foot pads assure proper alignment. Hold down grips provide ultimate stability for a worry-free workout. No compromises hereóthis machine was engineered to deliver strength, comfort and safety.