The Compex Performance Muscle Stimulator is recommended for the fitness enthusiast and the athlete who engages in frequent competition. It features a total of 5 programs, with 5 levels of progression to help competitive athletes achieve the highest level of performance. The Endurance Program increases muscle capillarization and establishes a working regimen for oxidative power of endurance muscle fibers; targeting slow-twitch muscle fibers. The Resistance Program targets both slow and fast-twitch muscle fibers; building muscle size, strength and density. The Strength Program targets fast-twitch muscle fibers. This program increases sheer strength, and works the muscles at maximum power with less risk of injury to joints and tendons, with virtually no cardiovascular or mental fatigue. The Active Recovery Program does not contract the muscle. This program clears lactic acid, increases blood flow, promotes muscle relaxation and enables faster recovery. The Pre-Warm Up Program does not contract the muscle. It runs at a low frequency and increases blood flow and oxygenates the muscles prior to a workout or competition. The Compex Performance Muscle Stimulator kit includes a carrying case, battery charger, CD with user manual, electrode placement guidebook, and a set of 4 easy snap electrode lead wires. Also included are 2 packs of 4, 2” x 2” easy snap gel electrodes, and 2 packs of 2, 2” x 4” easy snap gel electrodes.