Spinervals DVD 20.0 The Sprinting MachineSpinervals 20.0 - The Sprinting Machine, will enhance your short burst sprinting abilities by developing those hard-to-reach fast twitch muscle fibers and improving your nervous system response. This workout is for experienced competitive cyclists who have a high level of aerobic base fitness and are ready to take it to the next level of performance! Compatible with all stationary bikes. Limited Quantity!0689076283489
