We will be shaken in the process of self-challenge without a firm aim.

如果没有坚定的目标，在提高自身素质、自我挑战的过程中就会彷徨、动摇。

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Besides, exercise is also a kind of self-challenge to improve our willpower.

除此之外，健身也是一种挑战自我，提升意志力的好方式。

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The Olympics spirit is one kind "is quicker, is stronger, is higher" the self-challenge spirit, simultaneously it is also fair, fair, equal, the free sports athletics spirit.

奥林匹克精神是一种“更快、更强、更高”的自我挑战精神，同时它也是公平、公正、平等、自由的体育竞技精神。

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The Korean director Hong Sang-soo takes on the self-imposed challenge of filming boredom and frustration without becoming boring and frustrating.

NEWYORKER: Night and Day

For experienced ultra-runners the challenge of self-sufficient running in the extreme heat of the Sahara is too good to ignore.

CNN: 220 km Sahara desert run: 'The toughest race on Earth'

But the juxtaposition of self-evident with self-executing sets forth a challenge that every executive faces.

FORBES: Second Inaugural Address: A Lesson for Executives