Feeling of satisfaction

Playing squash is not always satisfying. I have to play well in order to feel good. I certainly don't feel so great from last night's practice. My knees felt loose and weak last night. I couldn't get my game going. After a night of practice like that I have no desire to play again. Unlike playing squash, lifting weights used to feel so good all the time. I want to add that back into my routine if not for the benefit of bulking up a little, at least I will feel good after each workout.