4. Banana with peanut butter and honey
“Bananas are mother nature’s power bar: They’re loaded with simple carbs for fuel and potassium, which helps with optimal nerve and muscle function,” Mazur says. Top one off with a serving of peanut butter—or any other nut butter you like. (Just try to stick to the recommended 2Tbsp serving size.) If you want a little sweetness, drizzle a bit of honey. It’ll release slow, steady levels of glucose into your bloodstream—great for grueling WODs and endurance workouts when your body can start using muscle glycogen as fuel if it doesn’t have enough readily available carbs.