The BOSU® Ballast® Ball, is a specially designed stability ball with 2.5lbs of weight inside, helping the ball to stay in stationary during use. Use the Ballast® Ball the same ways as a traditional stability ball, or lift it, shift it and shake it for all new dynamic exercise activities. The BOSU® Ballast® Ball is suitable for all populations and integrates easily with all types of fitness equipment. Includes foot pump and workout DVD.