Exercise may hold the key to youth, according to a study which showed people who keep fit are up to nine years biologically younger than those who do not.
一项研究表明，锻炼身体是永葆青春的秘诀。研究发现，健身的人比不怎么锻炼的人在生理上要年轻九岁。
In general, keeping fit needs to do exercise, keep a balance diet and keep a good mood.
总的来说，要保持身体健康就要锻炼，保持均衡饮食和保持一个好心情。
Now people are afraid to be ill, so they do a lot of exercise to keep fit.
现在人们担心生病，所以他们进行充分的锻保持健康。
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