作文文题：
The Importance of Physical Exercise
参考范文：
The Importance of Physical Exercise
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 co - ordinate 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.
Exercise can also contribute to the development of our ability to response agilely. For instance, when you play table- tennis, you must try to reflect as quickly as you can so that you may fight back at the right position at the fight moment.
Exercise can also contribute to improving our mood. When you do exercise, you move a lot, and you have to be more active. It helps you become more optimistic.
Exercise will fill your life with various contents and make it more colorful.
What's more, exercise will help you get rid of your inertia. If you keep doing exercise regularly, you will never be a lazy person. Therefore, exercise has great effect on one's character.
In a word, exercise is helpful, important and absolutely necessary.
Useful Words and Expressions:
indispensable: adj. 不可缺少的, 绝对必要的, 不能避免的
Life lies on exercise. 生命在于运动。
coordinate: v. 调整; 整理; 协调一致, 协同动作; 归于同一类别; 成为同等重要
blood vessel: 血管
agilely: adj.灵活地；头脑敏捷地
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