Aerobic exercise is a kind of fat-reducing exercise that can not tighten the skin. Need to cooperate with anaerobic exercise to tighten muscles and not relax. First anaerobic exercise, then aerobic exercise, so as to achieve the purpose of losing weight and tightening muscles. To lose weight by exercise, we must first understand the concepts of aerobic exercise and anaerobic exercise. Then make an exercise plan. It can not only reduce fat, but also shape.