25526.demanding(キツイ、過酷な）
It's less demanding and lets them have more leisure time.
25527.line of work(職種、業種）
I'He want to go into a more creative line of work.
25528.be struck by(驚かされる）
I was struck by his vast knowledge of history.
25529.mentally fit(精神的に健康な）
She says learning a second language help keep her mentally fit in old age.
25530.boredom and depression(退屈と憂うつ）
Work helps them stay mentally fit by preventing boredom and depression.
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