The M.A.S.S. Glutes-Back Plus is the safest and most effective way to perform the Back Extension exercise. The unique adjustable multi-pad system secures the user with the knees slightly bent, providing outstanding isolation on the glutes and back. The unit also offers leg and back stretching options. The stainless steel adjustment section features a gas-assist cylinder to make changing the angle easy. The foot plates feature an anti-skid surface. The front hand grip and rear wheels make it easy to move whenever needed.