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.

每個人都希望幸福地生活在這個世界上。對于幸福生活體育鍛煉是必不可少的。有一句名言：“生命在于運動”。雖然沒有規律的體育鍛煉你不一定會死，但是體育鍛煉能幫助你活得更久，更健康。

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.

鍛煉對我們的身體很好。運動的時候能夠幫助我們 協調身體的各個部分， 例如，打籃球的時候我們必須盡力使手腳協調，否則我們不會投中籃。運動也有利于我們的器官。它讓心跳比平時快，然后幫助擴大血管來預防心臟病。
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.

運動也有助于提高我們的反應能力。例如，打乒乓球時你必須要快速反映，這樣你才可以在正確位置反擊。
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.

運動也有助于改善我們的心情。做了運動，活動多了，你也會變得更活躍。它可以幫助你變得更加樂觀。
Exercise will fill your life with various contents and make it more colorful.

鍛煉會使你的生活變得豐富多彩。

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.

而且運動可以幫助你擺脫你的惰性。如果你經常鍛煉，你永遠都不會成為一個懶惰的人。因此，運動對一個人的性格有很大的影響。

In a word, exercise is helpful, important and absolutely necessary.

總之，運動是很有用，很重要，當然也是很有必要的。