By Jeff Halevy for U.S. News I am aware of how nuts this sounds coming from me. I'm supposed to be a motivational guy who encourages you to give "110 percent" every time -- you know, the "Biggest Loser"-style cum Facebook WOD approach to working out. But in the age of CrossFit and other high-intensity regimens, and the enduring age of all-or-none exercise commitments, I encourage to never give it your all when training.