Everyone hopes to live happily in the world. Physical exercise is indispensable to a happy life. There is a famous saying: \"Life lies on exercise.\" Although you will not necessarily die without regular physical exercises, they'll certainly help you live longer and more healthily.
Exercise is good for us to build our bodies. It helps coordinate the different parts of our bodies when we have sports. For example, we must try our best to coordinate the movements of the arms and legs when we play basketball, or we won't be able to shoot the basket. Exercise also benefits our organs. It lets the heart beat faster than usual, and then helps enlarge the blood vessels to protect us from heart attacks.
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