Celebrity trainer Gunnar Peterson's advice is as straightforward as his intense workouts: just do it. When you make a new resolution to get fit, "don't make a big deal" out of it, he says. "Of the three D's involved — decide, discuss, and do — eliminate 'discuss.'" The perfect plan? "Fuel for your workout, warm up so you don’t get injured, train with intensity, fuel postworkout, try to get good sleep, and then on Saturday, have your wine," he says. Cheers to that!