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.markbroyard.com/flash-grab-v-syndicate-thc2-einstein-shatter-resistant-glass-rolling-tray-sale-super-save/