I have an injury to my shoulder, nothing serious, but it has been lingering. It is just a muscle issue and I was trying to ignore it however I figured I better rest it so that it can heal. I am still training and lifting but trying to avoid shoulder/chest exercises because that is when it hurts. I decided, since it is my right shoulder that is hurt, that i will just do shoulder/chest exercises with my left arm. Does this seem like it is worth it?