The subjects represented a variety of occupations in several different parts of the country and responded to an annual survey in which they were asked: how often and how strenuously do you exercise?

被调查对象代表着该国若干个不同地区的形形色色的职业，他们对每年度调查中的二个问题——你运动的频繁程度如何？运动的力度如何？——作出回答。

youdao

I personally feel this is an interesting exercise to do as you soon realize how little movement your eyes are often given when sitting in front of your computer.

我个人觉得，这是一个有趣的锻炼，因为你很快就会明白坐在电脑前时，你的眼睛运动的是多么少。

youdao

They say it is important to find a balance between how hard the exercise is, how long you exercise for and how often you exercise.

BBC: Can too much exercise cause a stroke?