Your body weight is regulated by the number of calories you eat and use each day. Everything you eat contains calories, and everything you do uses calories, including sleeping, breathing, and digesting food.
Research consistently shows that regular physical activity, combined with healthy eating habits, is the most efficient and healthful way to control your weight.
Physical activity helps to control your weight by using excess calories that otherwise would be stored as fat. Any physical activity in addition to what you normally do will use extra calories.