Four products in 1: Stability Ball, Balance Disc, Wobble Board, and Plyo-Box. With the “bubble” side up, you can sit, stand, lie, kneel, or jump. With the Platform side up, you can do push-ups or even stand on it for an advanced balance workout. Virtually any exercise that can be performed on the ground can be performed on the Bosu, making that exercise more challenging and fun. Can be used for all training levels. More air makes the ball more stable. Not made with natural rubber latex, burst-resistant material is designed to hold people up to 350 lb. Weighs less than 13 lb. Measures 25" in diameter and 12" high when fully inflated.