A mainstay as a healthy snack, trail mix has become the de facto hiking fuel for a reason. You just have to make sure you choose the right one — go easy on those yogurt-covered raisins, chocolate bits, and M&M's! You also want to keep portions in check, too. One or two handfuls is usually all you need to power up after a workout. If you're worried about the nutritional mixes, use one of these recipes to make your own.