Heavy Strength & Explosive Power Day! 10 Moves NFL football prospects Jamichael Watts, Miles Fox, and John Boyd. Here’s a full body strength & power contrast workout I took some of the athletes through during a recent workout. Contrast training involves performing a heavy overload exercise several minutes prior to an explosive movement that uses the same muscle group. The goal is to achieve post activation potentiation (temporary increase in explosive power) from increased motor unit recruitment