"My favorite post-workout snack is a small bag of low-fat or fat-free popcorn with one scoop of chocolate whey protein powder (sprinkle it in after it comes out of the microwave and shake a few times)," says Marta Montenegro, an exercise physiologist and creator of the Montenegro Method DVD series. "Popcorn is one of the best whole-grain sources to replenish glycogen storage after working out, while the whey protein powder nourishes the muscles and assists with recovery. This snack fits the bill for both an endurance and a resistance type of workout."