Exercise is also important to help your body grow. Activity is part of the calorie balance. In addition to burning up calories, activity is necessary for health. Exercise helps build strength, keeps your heart healthy and helps build bone. Exercise can help you cope with stress and make you feel better.
Exercise builds strength by making the body more muscular.
Yon can have a normal weight or even be under weight and still have to much body fat if you didn't exercise. Too much body fat is not healthy. So even if you're trying to gain weight, you should exercise. If you're trying to lose weight, exercise can make it much easier by burning more calories and by building up muscle, which burns more calories than fat. Certain types of exercise have other benefits as well.