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1. An apparatus for relieving pain of a back muscle of a user, the apparatus comprising: a base having first and second longitudinal sidewalls and first and second lateral sidewalls, wherein a length of each longitudinal sidewall is longer than a length of each lateral sidewall; a slanted portion extending from a first major side of the base and continuing to extend from an edge of the first lateral sidewall of the base to a midpoint of the base, the slanted portion comprising a planar surface along an entire length of the slanted portion; and a trigger portion extending from a first major surface of the base and having a curved portion extending from the second lateral sidewall of the base; wherein an obtuse angle formed by the slanted portion with the base is in a direction of a perpendicular end wall of the trigger portion; wherein the slanted portion is configured to cause a shift in a center of gravity of the user towards a target side of the back muscle of the user; wherein a single, unitary piece of thermoplastic polyurethane includes the base, the slanted portion, and the trigger portion; wherein the back muscle is a quadratus lumborum muscle of the user, and wherein the trigger portion is configured to use body weight of the user to apply pressure to the back muscle.
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