Stand up straight with your feet placed approximately shoulder-width apart. Hold a soft medicine ball with both hands directly in front of your torso. From this starting position, start the countermovement by raising the medicine ball above your head while fully extending your body. Then, slam the ball into the ground directly in front of you as hard as you can. Retrieve the medicine ball with both hands and return to the starting position. Focus on quality, rather than speed by taking a deep breath in between repetitions, and, of course, be sure the ball does not bounce back up toward your face.