I am supposed to go to the gym tonight, although I don't want to. I happily do all sorts of exercise every day, but I don't enjoy the gym work outs much.
I have to remind myself that lifting weights is very good for me. Among other reasons, I have been able to recover from an annoying and painful shoulder injury by gently working out that area for several months and gradually increasing weight and repetition. A year ago I would have said my shoulder would probably require surgery to function properly, but now it is about 90% of normal and I wouldn't have surgery, even if it were offered.