In laboratory simulations of challenging activities such as driving, those who felt in control of their lives pumped out lower levels of stress hormones such as cortisol.

在实验室的挑战性活动（比如驾车）的模拟中，那些觉得生活在自己的掌控之中的人产生的应激激素（比如皮质醇）更少。

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They consider we should arrange some challenging activities.

他们认为我们应该安排一些更具有挑战性的活动。

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And they tend to be engaged in stimulating or intellectually challenging activities.

而且，他们还倾向于参加富有刺激或智力挑战的活动。

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Some previous studies have suggested that challenging your brain with mentally stimulating activities might help.

VOA: standard.2010.06.17

Researchers at Rush Medical University found that mentally challenging activities, such as reading and playing chess, may have a protective effect on the brain and help lower risk of dementia associated with Alzheimer's disease.

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Also, some activities were physically challenging and terrifying.

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In addition to stunning scenery, the Sunshine Coast is ripe with outdoor activities, with choices ranging from relaxed family fun to challenging adventures.

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