Oatmeal contains soluble fiber, which slows down digestion and provides all-day energy. It’s low in fat and easy to whip together. Before hitting the gym, indulge in a bowl of oatmeal topped with fruit. While oatmeal provides protein, many fruits like grapefruit, plums and oranges supply a boost of carbohydrates, making for a powerful (and delicious) pre-workout combination.