The body uses fat as an energy source during exercise, especially at lower intensities. Fats are broken down into fatty acids and transported to muscles, where they can be utilized for energy. As exercise intensity increases, the body shifts towards using carbohydrates, but during longer-duration activities, fat becomes increasingly important again. This metabolic shift allows athletes to maintain energy levels during extended workouts. Adequate fat intake in the diet supports this process, providing the necessary energy reserves. Combining aerobic exercises with a balanced diet rich in healthy fats can optimize fat utilization during physical activity.