Directions
Stand with feet shoulder-width apart, knees slightly bent and a non-bounce medicine ball held overhead. Throw the ball down forcefully to the ground in front of your feet. Exhale during the movement and contract the abs powerfully. Catch the ball as it bounces from the floor. If there's no bounce at all, keep the ab muscles engaged and pick the ball from the floor. Lift the medicine ball back to the starting position and repeat for all reps.