Hammer Strength HD SPARC

Hammer Strength HD SPARC. The Hammer Strength HD Sparc develops maximum force and sprint speed with no stress on the knees or joints. Built to a higher standard, this unique machine is a durable performance trainer tough enough to handle the most demanding workouts. The HD Sparc requires a high-knee and glute driving force which is ideal for developing force.- Hammer Strength HD SPARC.