Abstract: A machine for rehabilitating and exercising the lower back. The machine includes a stationary seat having an adjustably positioned footrest, and a pivotally mounted seatback. The seatback has adjustably positioned handgrips and a dead man switch. A motorized hydraulic system moves the seatback to incline forwardly from the vertical, and to return to the vertical. The degree of pivot is adjustable. A pelvic restraint secures the user'sbody in operative position, so that all work must be performed by the back. A strain gauge provides an input to a microprocessor, which in turn activates a display indicating effort. The hydraulic system is powered so as to move the body either in the absence of muscular resistance and in the presence of even maximal resistance.