From my experience, endurance training isn't just about pushing through workouts; it requires carefully balancing your energy intake and expenditure. I found tracking my daily calories and macronutrients, especially protein, carbs, and fats, made a huge difference. On challenging training days, I aim for around 3,800 calories, with protein and carbs to support muscle recovery and sustained energy. Incorporating a calorie budget system helped me avoid underfueling during sessions. For example, on one of my training days, my goal was to consume 3,818 calories while exercising enough to burn 1,103 calories, leaving me in a slight calorie deficit, which supported fat loss without sacrificing endurance. Prioritizing carbs helped maintain glycogen stores, while adequate protein preserved muscle mass. I also pay close attention to the fluctuations in energy needs based on workout intensity and volume. Endurance workouts can be highly demanding, so managing fatigue by adjusting nutrition and hydration is essential. Remember, consistent monitoring combined with tuned nutrition supports longer, higher quality training sessions and ultimately better endurance performance.