Abstract: Therapy apparatus for the exercise of the patient's trunk, back, spine, abdomen and shoulders consisting of a platform having a periphery and upper and lower sides. A pedestal or column extending vertically above the platform upper side supports a seat receiving the patient, and the platform lower side includes a central supporting projection extending below the platform periphery wherein the platform will engage a flat supporting surface, such as the floor, at the support projection and the platform periphery in a tilted manner and a patient located upon the seat may shift their weight to change the angle of platform tilting for exercising the patient's trunk, back, spine, shoulders and torso muscles and ligaments. Support projections of various vertical dimension may be employed to vary the extent of tilting from the vertical, and the apparatus may be utilized with computerized equipment to obtain accurate determination of the extent of exercise and body flexibility.