Stand with feet shoulder width apart. Hold medicine ball with both hands.
Lift ball above head while extending body. Reverse direction and slam ball into ground. Catch ball back with both hands and repeat.
If ball does not bounce, keep hold of it during slams. Downward movements such as Spinal Flexion and Shoulder Extension resists against inertia of ball in attempt to accelerate ball's speed downward. Upward movements such as Spinal Extension, Hip and Knee Extension, and Shoulder Flexion merely raise ball back into starting position. Some individuals may exhibit only static Spinal Flexion and Extension (ie: no spinal movement). Although Elbow Extension is far from full range of motion, it is short but typically significant.