My recommendation is to take Juice Plus+. In addition, I recommend the green drink from Do You Have The Guts to Be Beautiful?, and add Juice Plus+ Complete. Start each day with a huge green drink, which fuels the body for performance with complex carbohydrates, protein, fats, antioxidants and other phytonutrients, trace minerals and fiber.
In general, it’s important for an endurance athlete to eat loads of whole grains for calories, and to consume huge amounts of fruits and vegetables.
For more information on exercise for athletes, see the attached article.