The larger the ball, the more trunk and hip strength is needed to support the shoulders working with the weight. Team interaction increases performance and accelerates learning, so use the balls in a pool, or on deck, on the field, grass or mud and on the court. Soap and water will clean them up. Variations of free weight exercises, squat, lunge, press and raises, with the ball saves the learning time of new drills. And in fact, balls add resistance over a greater range of motion than the weights.
Medicine balls are the best because they add weight at the end of the lever arm.
For instance, jump squats combined with a medicine ball push press can be used to improve rebounding in basketball and volleyball shot blocking. The Speed Plus Start training for strength with this ball by learning form, balance and developing the trunk hip shoulder connection. Then switch to the larger, heavier Strength Builder for strength, and then back to throw the Speed Plus for power. The bigger ball size builds strength by working the trunk harder, as the shoulders hold and lift the heavier weighted ball. The Speed Maker Speed, fast hands and feet can be added after strength and power.