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 .