A runner can't survive on simple carbs alone, but they're a great way to get quick energy 15 minutes or so before a workout (or even during an endurance run). Choose small servings of foods that are low in fiber to prevent digestive upset. Snack on half a banana, a handful of grapes, or a few strawberries. The sugar will offer a quick pick-me-up to inspire you to lace up your sneaks and head out the door.

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