Full commercial grade leg extension and seated leg curl machines have a nice natural movement that allows for maximum muscle range of motion. These units are ideal for physical therapy and rehabilitation as the hand grips and foot platforms are angled to keep joints in a neutral position. These machines keep joints in a neutral position by angling hand grips and the foot platform. As a result, these used strength machines safely maximize your workout experience. Furthermore, the counter-balanced movement arm minimizes starting resistance. This set contains: Quantum Fitness Leg Extension (Black Frame/Maroon Pads) Quantum Fitness Seated Leg Curl (Black Frame/Maroon Pads) Founded in 1990, Quantum Fitness is a manufacturer of commercial equipment for the medical and fitness markets. Their roots which were in the medical and rehabilitation markets. Quickly, they expanded into fitness as the demand increased for workout facilities.