People have been telling me that I am spending too much time in the gym with my exercises and "over-working". For instance, tomorrow is Back-Biceps day for me and I will do anywhere from 15-20 or maybe a few more total sets for my back. For my biceps, I usually do another 15-18 total sets. If I try doing anything less and leave the gym, I feel as if I should have worked harder! And that I didn't stimulate my muscles enough... What do you think?!?