Exercise and nutrition both a play a role in improving fitness. The best exercise program won’t get you results if you ignore the fuel you put in your body. Not only will excess calories prevent you from losing weight, but an eating plan that lacks lean protein, vitamins, and minerals can make it more difficult to gain muscle and recover after tough workouts. Also, filling up on foods that are high in refined carbohydrates can leave you feeling sluggish and hungry with little energy to exercise. Make your diet as much of a priority as your exercise, and choose a balanced eating plan that matches your fitness goals.