Abstract: An apparatus for manipulating a user's back while supporting the user's back and hips includes a support defining a longitudinal axis, and a seat pad disposed along the support at a position corresponding to the user's hips for supporting the user's hips. The seat pad is rotatable around the longitudinal axis and has an attached seat belt for holding a user on the seat pad. A pair of handles are provided, one on each side of the seat pad, which are coupled to the seat pad and which are movable in reciprocal back-and-forth motion to control rotation of the seat pad around the longitudinal axis. A resistance device is coupled to the seat pad or elsewhere for providing resistance to reciprocal back-and-forth motion of the handles, and two mechanical stops are provided, one on each side of the apparatus, for limiting rotation of the seat pad. The mechanical stops each have plural settings for adjusting a maximum angle of rotation of the seat pad.