Glycogen is a stored form of glucose found in the liver and muscles, essential for athletes during physical activity. It serves as a primary energy source, especially during high-intensity exercise when rapid bursts of energy are needed. Proper glycogen levels enhance performance, stamina, and recovery. Athletes should focus on carbohydrate-rich diets to replenish glycogen stores post-exercise, ensuring enough fuel for subsequent training sessions or competitions. Understanding the role of glycogen in energy metabolism helps athletes optimize their nutrition and performance strategies, leading to more effective training outcomes and improved results in their events.