They perform their own stunts.

VOA: standard.2010.07.20

Each show, six contestants from around the country battle each other in three extreme stunts.

每次节目，六名来自全国的参赛者,在三项极限特技中一比高下。

耶鲁公开课 - 公正课程节选

These stunts are designed to challenge the contestants both physically and mentally.

这些特技项目专为在体能和精神上,挑战参赛者而设计。

耶鲁公开课 - 公正课程节选

Six contestants, three stunts, one winner.

六名选手，三项特技，唯有一名胜者。

耶鲁公开课 - 公正课程节选