The Sprint Trainer is a revolutionary piece of science and ingenuity built for human speed and strength development. It has no equal and there is no other. Its patent pending technology allows you to dial in a complete and totally devastating workout that acts on the 3 Energy Systems in the body. Brutal, lung depletion occurs, and the musculature of the body is driven past a fatigued state into the Reflex Zone. The workout is demanding and the recovery from the workout is minimal. What occurs in the body while using the Sprint Trainer can easily be explained scientifically.