Background: Posterior shoulder tightness has been proposed to contribute to or cause a myriad of shoulder conditions. The tightness of the posteroinferior capsule and the teres minor and infraspinatus muscles of the posterior cuff has been hypothesized to cause osteokinematic [e. g. https://www.roneverhart.com/Chateau-d-Esclans-Whispering-Angel-Rose-2020-375ml-6-Bottle-Case/