My rotator cuff has given me problems for years. Everytime i got serious about bench/chest, it would soon thereafter flare up. But the past 6 months I've learned that regular rotator cuff exercises are a very useful tool for preventing that. Stand at the pulleys and do upward rotation, outward rotation, inward rotation, and even on your knees downward rotation. That's for prevention.
Couple months ago, before I had this down all the way, i injured it pretty bad. Took a week and a half off, and did about an hour everyday with a 5lb weight, just tons of reps, slow and controlled, right in that exact position that gave me the most pain. Worked like a charm.
