hydroxicut is about 80% caffine. It raises your heart beat and body heat and causes you to lose weight because your body is working harder to speed up your heart beat. This is also why you need to drink so much more water.

If you have access to a pool swim for 20 or 30 minutes 3 or 4 times a week. You will burn nearly twice the calories that you will running, FAR less impact on your body, and honestly its more fun.