I use to be pretty strong and was able to bench twice my weight. About 12 years ago, though, I developed rotator cuff problems so I stopped benching and shoulder presses and eventually pretty much stopped lifting altogether. Anyway, I started back up about 6wks ago hoping that the pain wouldn't return. So far so good but I want to start building my chest back up and have done a little bench with really light weight - like 90lbs on a machine incline press. I'm not sure if it is doing any good and I'm not sure whether more reps with light weight is easier on my shoulders than heavy weight with fewer reps. I also feel a little silly doing such a light weight. Any advice is appreciated.