I have this problem a lot when I swim, but I felt it merited a new thread. See, I have very inflexible shoulders. If I move it too far up or back, it sometimes pulls back slightly and locks in place. It's very very painful... Stetching helps a little, but sometimes it happens even when I stretch. I'm not sure what it is, but it may be frozen shoulder... I can say that I feel something move out of place in my shoulder when it locks, but I was reassured by my Adv. Phys. and Condition teacher that it is not a dislocated shoulder. Anyone have any clue on what this may be or how it could possibly be fixed? I am not going to get X rayed... if it is very serious, I might get DQed for my ROTC scholarship. It does greatly hinder my ability to swim though.