Compact Medicineballs are weighted balls, great for throwing, passing, or rolling. Weighing 2.2 to 11 pounds, these colorful balls are soft to the touch and easy to grip. "Plyometrics conditions the body through dynamic, resistance exercises. By using a medicine ball to create the necessary resistance for these exercises, you can experience the entire range of motion which resembles that of your sport. These sport-specific exercises are not only more efficient in developing the power you desire, but more interesting, more challenging, and more motivating.