Fact Check: Mixture
While this quote is funny and motivational, this is physiologically incorrect. Sweat is a way for your body to help regulate body temperature and keep your body from over heating, much like shivering helps keep your body warm when it is cold outside. What weight you do lose when you sweat is water weight. When you exercise your heart rate goes up as does your temperature. Heat will escape through your circulatory system where heat can be lost into the air. Your body burns calories as you exercise. To hit the fat burn zone during your exercise (or utilize the aerobic energy system of your body), you must do at least 30 minutes of moderate intensity aerobic exercise such as walking, running, swimming, biking.