This is because they contain a good amount of digestible carbohydrates. They are also rich in potassium which helps maintain nerve cells and overall muscle function. Our body is not able to store potassium for long, which is why eating bananas before training will significantly improve nutrient levels. Bananas are highly recommended for morning exercisers, so you can eat a medium one with a cup of milk or Greek yogurt. Wait about 40 minutes, then start the exercises. This way I guarantee that your body will get adequate proteins and carbohydrates. Wholemeal Bread Having 2 slices of wholemeal bread will add vitamins and carbohydrates to your body. There are many ways to eat wholemeal bread. You can top it with peanut butter, honey or jam and eat it with some fried eggs for a good protein boost. 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