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Crucial components to an effective fat burning workout include

1. Aerobic exercise
2. Weight training
3. A nutrient dense diet of natural foods with a mild calorie deficit
4. Goal setting, motivation, and a positive self image

Aerobic exercise combined with weight training is the only method of fat loss that allows you to create a calorie deficit and burn fat without slowing down the metabolism.

Exercise increases the cells sensitivity to insulin so that carbohydrates are burned for energy and stored as glycogen rather then being stored as fat.

Exercise, espesially weight training, signals your body to keep your muscle and not burn it for energy.  Dieting without exercise can result in up to 50% of the your weight loss to come from lean body mass.

If anyone ever tries to sell you a diet program for losing weight and it doesn't include exercise, hold on to your wallet and run for cover.  Even if you could get lean without exercise, you should be working out for your health anyway, not just for cosmetic reasons.