My current favorite shoulder exercise:the W Press. Start with arms by side, making a "W" shape, and by pressing up and out you hit all 3 heads of the deltoids while avoiding strain on the rotator cuff. (At least for me, still experimenting.) You don't have to go heavy to feel this one. I saw this move in Iron Man Magazine, but a google search says it's an old school bodybuilding move created by Larry Scott.