on your next 20-miler in a carb-depleted state. Instead, wean yourself from carbs by consuming them less and less before and during long runs to train your body to manage without them, says McMillan. Carry a gel or stash a bottle of sports drink along your

muscles," says Bean, "so you don't want to fill it with anything solid. Energy bars and gels need to be broken down in the stomach, but drinks don't." Therefore, stick to sports drinks unless it's after running or on easy-paced runs or run/walks. Try (fat

You've heard the usual recommendations for so long that you accept them as gospel. And most of the advice is solid. Who can argue with putting in mileage, peaking for races and stretching after a run? But just because many coaches, sports