okay, you got me. None of the above actually told you what DUP is, but l like to keep the intrigue going as long as possible. What it hopefully did, however, was show that just because most bodybuilders only a hit muscle group once a week, that doesn't make it the only way. It does not even make it the optimal way to train. Likewise, higher frequency training could potentially have even more benefit. And this is where DUP comes in.....