The body burns fat from a difference between energy put into the body through eating and energy that the body needs to supply fuel to the muscles and bodily functions.

If the energy it needs to operate is more than the energy in the food we eat, then the body kicks into fat burning mode to make up the difference.

Hence, exercise is about the only way to put more demand on the body for energy consumption above and beyond your normal daily routine.

The best weight loss with exercise is achieved when you put your body into its "fat burn" zone of operation and keep it there for a while without interruption.

The fat burn zone of your body will depend on your gender and your age. Check with your local gym. They usually have charts that show you the heart rate range for your age group.

The best fat burn zone for your body will be between 60% and 75% of your maximum heart rate as indicated by the chart.

Here is something to remember. When you exercise at the rate where your heartbeat is in that range, you should still be able to carry on with normal speech. You should not be so out of breath that you have trouble talking or have to gasp for air. If you have to do that, slow down, you're overdoing it.

It is important to keep your body in that zone of operation for at least 30 minutes. Your body only begins to burn fat after a good 10 to 12 minutes of exercise. During that time it first consumes the immediate nutrition that is available to it.

For fast weight loss with exercise you will probably need to go for longer than 30 minutes. An hour to ninety minutes would consume a sizeable chunk of fat every day.

Once again, do not overdo it. Doing this for three hours a day is probably going to be worse than better. One disadvantage is it is going to leave you completely exhausted.

Also accelerate your metabolism while you are exercising like this. You do that by eating six to seven small meals per day.

Remember, whenever you're exercising and you start feeling dizzy, nauseous, or experience pain or discomfort, stop immediately and consult with your physician.

Fast weight loss with exercise is not worth pushing yourself beyond your physical limits and causing your body to suffer serious damage.