A device avoiding the use of any motor or perpendicular or rectangular elements, having a convex asymmetrical longitudinal curve, a central longitudinal groove, and mirrored perpendicular and latitudinal, symmetrically-matched convex curves extending from the central groove to the sides, and optimally surfaced with a soft dense foam, uses gravitational force on the body of a user to provide an effective, yet gentle stretch along the length and across the width of the back, particularly at the thoracic vertebrae thereby relieving postural mechanical shoulder, back or spine pain. Additional alternative embodiments using a heating, cooling, or vibrational element along the central longitudinal groove are also described and claimed herein.