Interval running improves endurance for athletes by incorporating periods of high-intensity effort followed by recovery intervals. This training method boosts aerobic capacity and increases the body’s ability to sustain prolonged efforts. By alternating between fast and slow speeds, athletes can enhance their speed and improve muscle efficiency. Interval training also promotes cardiovascular adaptations, allowing the heart and lungs to work more effectively. This method is particularly effective for building stamina and enhancing performance in competitive settings.