Bananas are among the best pre-workout and pre-race foods for runners. Bananas are almost all carbohydrate. A large banana contains more than 30 grams of carbohydrate, just 1 gram of protein and no fat whatsoever. Bananas are also extremely high in potassium (400 mg), which is lost in sweat during exercise. Their softness and light taste make them easy to consume even with pre-race nerves, and their natural “wrapper” makes them handy for eating on the road.