This video describes the ways people hold onto fat. There are three main types of bodies. There are naturally skinny, round with an easy time gaining weight and overly round with a hard time losing weight. Each person is different but in certain body groups there is an easier time to maintain a lean appearance. Fat cells in your body also play a part in you getting fat and staying thin. It is said that all of your fat cells have been fully grown in your puberty years. There are some new studies that are challenging this. But for the most part these fat cells can either expand or contract. With this information it is a good idea to live an active life.