Infraspinatus — part of the rotator cuff. Origin: infraspinous fossa of the scapula. Insertion: greater tubercle of the humerus. Action: external rotation of the shoulder and stabilization of the humeral head in the socket. I position the elbow at 90° from the body, externally rotate to shorten the muscle and find my tissue, then apply thumb pressure while the client slowly internally rotates to lengthen and release the fibers. #rotatorcuff #shoulderpain #massage #bodywork #mobility