In reply to Misha: I have had shoulder problems for well over two years now and they became acute 15 months ago, stopping me climbing. I've done next to none of the rehab exercises I've been given (because I am stupid and self-pitying) and even after this long of not doing ANY exercise, they hurt almost as bad as the first time they kicked off. This absolutely sucks. I have become one unhappy individual.
At this point, I may never climb again.
My point. I had bad (but not crippling) shoulder issues. I was given an orange theraband. They aren't expensive. I would start slowly with an entry level band and upgrade.
Since seeing that article I am resolving to be active. But my misery is two fold. Not only can I not climb, but I can't exercise to stay in shape and keep myself sane. Prevention is better than cure and active rehab is better than waiting for Harry Potter to fix your shoulders for you.