Sometimes the gleno-humeral joint, scapula and rib cage need to be reminded how much they need to cooperate.  Using the rotational aspect of Core-Tex and driving a bottom-up reciprocal rotation between the pelvis and thoracic spine gets this done for you.  This "coil to uncoil" combined with various arm reaches enhances scapular motion and reinforces the shoulders connection obliquely to the opposite hip both through the anterior and posterior oblique lines.