Last month I finally decided to address my left shoulder problem, which has bothered me for probably a decade or two (I can’t recall when it started and it feels as if it has always been there). The problem is that I find it quite effortful to externally rotate my left arm. It feels like I was born with some abnormal bone structure that prohibits me from properly rotating my arm, at least this is what I considered highly probable before seeing the PT (physical …