The menu plans for the endurance athlete include a greater amount of carbohydrates to help fuel your endurance training. Of the calories in each day’s menu, approximately 65% are carbohydrate insuring that your muscles contain ample glycogen (stored carbohydrate) to feed your working muscles. The high carbohydrate plan also allows your muscle and liver glycogen stores to be replenished, a critical part of endurance training, especially when you’re training multiple days in a row.