I'm a skinny dude, always have been. I don't wish to be huge, but would like to build up my arms and chest a little bit. But my big problem is my left shoulder. Whenever I do anything like bench presses or push ups my left shoulder pops, like you would pop your knuckles. Afterwards, I have a slight pain in my shoulder, nothing real serious, but does not feel normal, or as well as my right shoulder. I don't think I have ever injured my shoulder to my knowledge, and the only thing I can possibly relate it to, which I don't think really relates, is when I was born, they broke my collar-bone. For pretty much as long as I remember, I have had this problem though. I have no problems with my shoulder with my day to day activities, so it really hasn't concerned me. But I am curious if anyone has ever had a similar problem, or has an idea what would cause it. I remember asking my chiropractor about it before, but he really didn't answer my questions... that guy is a douche bag anyways though.