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A medicine ball is quite different from the large vinyl exercise balls. It is small, but heavy, so that a 10 lb medicine ball can be smaller than a volleyball. Medicine balls have been used by athletes for many years, but the new ones are better balanced and more durable. It is traditionally used for upper body power throws. Side throws against a rebounder strengthen your obliques. Hold the medicine ball on your chest or straight up to make crunches more demanding. You'll find many uses for a medicine ball.