For girls, exercise can do even more. Stretching, aerobic, and strength and muscle-building. Stretching means exactly what it sounds like. It increases flexibility and range of motion. It raises the heart rate a small amount.
Aerobic exercise is more that just aerobics.
It includes anything that temporarily raises your heart rate, like running, walking, swimming, dancing, and skiing. Aerobic exercise keeps your heart, lungs, and respiratory system healthy. Strength and muscle-building exercise builds muscle mass. This sort of exercise usually takes the form of weight lifting, which has to be done at least twice a week to be at all effective.