Glycogen plays a crucial role in exercise performance as it serves as a primary source of energy during high-intensity activities. Stored in the liver and muscle tissues, glycogen is converted into glucose when the body requires energy, especially during prolonged or strenuous exercise. When glycogen stores are sufficient, athletes can sustain their performance levels for longer durations. Conversely, depleted glycogen levels can lead to premature fatigue and reduced endurance. Therefore, managing glycogen through proper nutrition and carbohydrate intake is essential for optimal athletic performance.