Water is needed for cooling the body on hot days, and when we are working or exercising.

VOA: special.2010.07.27

OK. The process of writing is exercising both halves of your brain, and it's actually helping you learn, and so taking notes is really valuable thing.

好的，记笔记的过程同时锻炼了,你的左右脑，而且实际上帮助了你的学习，所以记笔记真的是一件特别有价值的事情。

麻省理工公开课 - 计算机科学及编程导论课程节选

Exercising is good for the body.

运动有益于身体。

It's important 实战 - SpeakingMax英语口语达人

Some experts believe it is the act of exercising itself.

VOA: special.2010.06.08

"I think the best advice I could have for Muslims is please exercise your freedom of speech as the cartoonist was exercising.

VOA: standard.2010.03.20