High-intensity interval training (HIIT) can significantly impact endurance by improving cardiovascular capacity and metabolic efficiency. HIIT involves alternating between short bursts of intense exercise and recovery periods, which challenges the heart and lungs and enhances oxygen utilization. This training style can increase both aerobic and anaerobic fitness levels, allowing individuals to perform longer and at higher intensities. Consistent HIIT workouts can improve stamina, reduce fatigue during extended activities, and increase overall athletic performance, making it an effective training method for endurance athletes.