Swimming is good exercise.

游泳是有益的运动。

《牛津词典》

Running on the spot is good exercise.

原地跑步是一种很好的锻炼。

《牛津词典》

Cycling is good exercise. It strengthens all the muscles of the body.

骑车是好的锻炼。它使全身肌肉变得强健。

《柯林斯英汉双解大词典》

Diet is surely important, but diet alone will not do much good without an exercise plan.

VOA: special.2010.06.08

Partly because I think it's a good exercise, but also I don't want this class to be a class where you sit there, with your cup of Willoughby's coffee if needed to keep awake, and you watch me solve models because that's not how you learn.

一方面是由于我认为这是个好的锻炼机会,此外,我也不希望这个课程,变成你们坐在这,用威洛比咖啡来保持清醒,一边看我解决问题,因为你们不应那样学习

耶鲁公开课 - 博弈论课程节选

And I think too, a really good exercise if you wanted to do is, if you have a dictionary,

我也认为，如果你想练习，如果你有字典的话，比较好的练习

有这样的困难 - SpeakingMax英语口语达人

Anything that gets the body moving can be good exercise, said Janet Fulton, a CDC epidemiologist.

CNN: Weight losers combat fear of exercise, schoolyard torment

It is alright when it is warm, but gives your gums a good exercise when cold.

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And you won't do that if you're not eating right and getting good exercise.

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