There are times that we just feel so heavy and want to just rest the whole day. This usually happens when we do not have much exercise. Maybe it also happens when our body becomes heavier. I guess when we do not have much exercies, the fat in our bodies are not burned and are left there to add to our weight and since our muscles are also not exercised much, we feel like our bodies are heavier. So I guess fat burner supplements can be used when we do not have enough exercise or want to burn up the excess fats in our bodies. With the correct supplement for your needs, you may be able to lose weight and feel lighter. Of course it is better to have some exercise to keep those muscles firm and strong.