They found that those who were most fit from moderate to vigorous exercise had a 37 percent lower risk of a stroke than those who were least fit.

他们发现，最适应中度至重度运动的人们比最不适应的人们中风的风险低了37%。

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They considered sufficient physical activity to be 30 minutes of moderate exercise five days a week, 20 minutes of vigorous exercise three days a week, or some combination of the two.

他们认为，充足的体育锻炼应该是每周五天进行半小时的适量运动，或是每周三天进行20分钟的激烈运动，或者对这两者进行适当结合。

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Men who were the most physically active, doing 15 hours or more of moderate to vigorous exercise each week by playing football, baseball or basketball for example, had sperm counts which were 73% higher than those who were least physically active.

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If you have no time for the gym during the week, that's OK: Recent research shows moderate to vigorous exercise even just once a week (say, a weekend jog) makes you 30 percent more likely to maintain your cognitive function as you age.

CNN: Helpful ways to boost your memory