This invention relates to health and fitness, and more particularly to exercise methods and devices. More particularly, the invention is directed to stretching exercises and physical therapy, for example an apparatus and exercises for lower back pain. The exercise apparatus comprises at least three cells abutting each other on a common base or frame. Each cell can be independently inflated and deflated to provide an adjustable support cushion having a range of shapes and firmness. An articulated frame is optionally provided for additional independent movement of the cells. Users lie down on the cushion and produce precise stretches and exercises by controlling the rate and degree of inflation or deflation of each cell or group of cells, and optionally, articulated movement of the frame. Stretching can occur passively, as when the body conforms to the shape of the cushion, or actively by exercising in concert with the conformation of the cushion.