A Stability Ball with a Flat Bottom *This versatile training device improves balance, core stability and proprioception. *Four products in one! Stability ball, Balance disc, Wobble Board and Plyometrics box. *With "Bubble" side up, sit, stand, lie kneel or jump. With platform side up, do push-ups or even stand on it for an advanced balance workout. *Any exercise done on the ground can be performed on the BOSU-making it more challenging and fun! This functional exercise device with its unique half-circle inflatable ball provides multiple applications for standing, sitting and supported body weight conditioning activities. Platform width is 25 inches in diameter with a height of 12 inches when fully inflated. Hand pump and guide included. Please call, additional shipping charges apply.