I've been dealing this ever since I first began weight lifting a few years ago in high school. It's only my left shoulder. At first I noticed it doing pushups. at the bottom of the rep, it just sorta pops. It's not really a pop though, I cant really describe it. Anyways, it did or for a while when I benched, and I really didn't like that, so I put in some effort to stretch, and I kinda managed to lose it for a while. It just showed up again the other day when I was doing pushups. My bench press has still be unaffected. Anyone have anything like this? Know what it could be? solutions? Thanks