Building endurance for long-distance running involves a structured approach that includes gradually increasing mileage, incorporating interval training, and ensuring proper recovery. Consistency is key; runners should establish a training schedule that balances hard days with recovery days. Nutritional support, particularly focusing on carbohydrates and hydration, plays a critical role in sustaining energy levels during longer runs. Cross-training activities can enhance overall fitness. Mental strategies, like setting incremental goals, also reinforce motivation and perseverance during extensive training periods.