The video below accompanies the last several  blog entries in which I wrote about how the  “corocoid corner” affects the stability of our shoulders and arms, and about the relationship between our arms and our hearts.  The tissues that clasp the corocoid process need to be pliable in order for the upper arms to seat properly in the gleno-humeral fossa (the shoulder socket).  When pectoralis minor and biceps brachii are chronically shortened and glued down around the corocoid, the humeral heads (tops of the upper arms) slip forward in the sockets. While this capacity of the shoulder joint lets us reach out for things, the position should be part of a temporary gesture.  For stability of arm and shoulder, the humeral heads should rest back into the socket as deeply as possible. The video shows one way to open up the corocoid area…