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The Ironman is next weekend. Coach Eslinger is competing. He plans to take GU gels during the race to replenish his glycogen stores. Why is it important to replenish your glycogen stores?
Our bodies can only store enough glycogen (in our livers) to maintain cardiovascular exercise for around an hour. Once the glycogen is depleted, the energy source turns to protein and fat. Protein and fat take much longer to convert to energy, so they are not useful.