The Best Fat Burning Heart Rate Calculator calculates the fat burning heart rate, which is important when choosing to exercise to lose weight. Fat burning only occurs when you exercise to a certain degree, such as exercising for more than 20 minutes to burn fat. You can also do some aerobic exercise, such as jogging or swimming, to promote the burning of fat, to be persistent. At the same time, before, during and after exercise should be supplemented with water to avoid dehydration, and it is not advisable to take a shower and eat immediately after exercise.