I think you're supposed to have at least one day off every week. When you're building muscle through progressive training (heavy lifting), they all say you should do a day on and a day off.

Everybody has six packs, most people simply have too much fat hiding those muscles. As long as you eat right, you'll eventually show six packs. If you don't eat right, nothing you do will get you there. What constitutes 'eating right' for body building is a book on its own.