Aerobic exercise will increase your muscles, make you stronger, make you less likely to get old and make your arms and legs thicker. You don't have to jump around all day. If you jump all day, lactic acid will be secreted in your muscles, which will affect your activities. Not eating after exercise is bad for your health, but you can't eat too much. Eat some vegetables and fruits to help digestion. The key point of aerobics is to make you exercise, sweat and lose fat. Whether you will lose weight depends on your personal situation.