I see countless shoulder injuries in climbers. Most of them can be attributed to weaknesses in their external rotators and scapular stabilizers, and over developed internal rotators. A simple way of thinking about this in your climbing is to keep those elbows IN! If you're winging, you're hurtin'.
Check out the video bellow to get an idea of what I'm talking about. It's not meant to be a training video simply a demonstration of good shoulder form. See whether you can apply this to your training so that it becomes more natural on the sharp end.
By William Bateman