Carlo Alvarez

Pre-Workout 

 If your last meal was more than five hours ago, have a 100- to 200-calorie snack 30 minutes before your workout. Liquids digest faster, so try milk, juice, Gatorade, or half a smoothie (keep it low-cal by choosing plain, low-fat yogurt and fruit and skipping syrups, powders, and other additions).

Mid-Workout

You need a snack during your workout only when you’re hustling for more than 90 minutes. Your best bet? A 100-calorie carb boost, like a handful of jelly beans or a sports gel such as Gu.

 Post-Workout

Ideally, reach for a snack that combines carbs and protein to aid recovery. Second best: carbs with fiber (like fruit). If your next meal is less than three hours away, be sure your snack is under 200 calories; try an energy bar with at least 3 grams of filling fiber, half a bagel with peanut butter, or low-fat chocolate milk.