I had dodgy shoulders for a couple of years and after a LOT of trial and error and a fair bit of cash spent on physio, stumbled across an exercise that sorted them out. Not sure if this is common knowledge or not but what I do is hang from a bar and retract and depress my scapulae as far as possible. Then just hold that for ten seconds and repeat a few times. I've been doing this a couple of times a week and my upper back and shoulders feel loads better.
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