This is because they contain a good amount of digestible carbohydrates. They are also loaded with potassium, which helps maintain nerve cells and overall muscle function. Our body is not able to store potassium for a long time, so eating bananas before working out will significantly improve your nutrient levels. Bananas are highly recommended for morning athletes. So you can eat a medium sized one with a cup of milk or Greek yogurt. Wait about 40 minutes then start your exercises. By doing this, I guarantee that your body will get enough protein and carbohydrates. Whole Grain BreadHaving 2 slices of whole grain bread will add vitamins and carbohydrates to your body. There are many ways to eat wholemeal bread. You can supplement it with peanut butter, honey or jam and eat it with fried eggs for a good protein boost too. You can have a slice of cereal bread a few minutes before going to the gym and your body will be very active and energetic.