This food is a staple in some countries but not really a famous food in the US. It is a tuber, like the regular potato but it is orange in color and yes, a bit sweet. It is ultra-healthy too. The sweet potato is rich in carbohydrates which can supply the necessary energy for you to complete your power workout. It is also packed with minerals like Potassium that can inhibit muscle fatigue and promote repair of muscle tissues quickly. Aside from that, it is an anti-oxidant type of food.