Glycogen is significant in physical performance as it serves as a primary energy source during high-intensity exercise. Stored in muscles and the liver, glycogen gets converted to glucose, fueling contractions essential for sustained activity. Adequate glycogen levels allow athletes to maintain endurance and performance, preventing fatigue during training or competition. Proper dietary intake of carbohydrates plays a critical role in replenishing glycogen stores, enhancing recovery and preparing the body for subsequent workouts.