Some people undertake extreme endurance activities because of something that they have control over.

有些人进行极限耐力活动是因为是他们可以控制的事情。

What motivates us is very different for each individual person. In terms of extreme endurance activities, it's an opportunity for individuals to test their limits, and to see where their boundaries are.

激励我们的因素因人而异。就极限耐力活动而言，它为个人提供了一个测试自己极限的机会，让他们看到自己的极限在哪里。