I have recently started doing the overhead press as per Starting Strength.
I am getting a pain when I get close to the full extension of the press. It feels like a tendon pain as it is in a very small area at the top of the shoulder joint.
The pain only occurs if I press more than about 30kg or so.
What could be causing that pain?
Or if its not that easy to tell over the internet what is causing the pain, what steps should I go through to try to locate and fix the cause?