I am an intermediate athlete who has been training seriously for 3-4 years, and recently I am experiencing a bit of pain in my rear delts when doing pull-ups. My biceps and my lats are both enjoying good progress with no pain besides soreness, however I fear that my problem could escalate to an injury. I suspect that this is due to neglecting shoulder training since I heard muscle imbalance in one part can cause injury in another, but it's just an educated guess. In your experience, are the shoulders a muscle group that must be trained intensively(via pike push-ups or Overhead presses) or are training compound exercises like dips and the bench press enough? Again, bad form and flexibility might also play a part but would like to know your perspective on the strength side.