This is for one of my buddies. He had shoulder surgery almost a year ago. He had torn one of his ligaments in half and the ligaments behind his shoulders were oose and the Dr. tightened them and repaired the torn one. If her took winny and a little test would this stack do him good or bad from the stand piont of his ligaments. Would it make his ligaments tight were he might tear them easier or could it posiibly helpwith his sit. Any help welcome