The “fat-burning zone” refers to an exercise intensity level where the body primarily uses fat as fuel. This zone typically occurs during moderate-intensity activities, where the heart rate is elevated but sustainable. It contrasts with higher intensities, where carbohydrates are the preferred energy source. Training within this zone can enhance fat oxidation rates and improve body composition over time. However, it’s important to recognize that overall caloric deficit plays a significant role in fat loss, regardless of the intensity.