Made using natural rubber, the Reebok Medicine Ball comes in 2 bright and appealing shades with a diameter of 23cm. Medicine balls have been used as training tools for over 3000 years. Effectively working the most important part of your body, most exercises involve vital core activation. Incorporate them into any training program, regardless of your age, gender or ability. Using the ball blends strength, coordination, balance, endurance, flexibility and accuracy.