Trek 125 kilometres, and cycle 250 more. Kayak 131, rappel through canyons for another 97, and swim 13 in churning whitewater. Throw in some horseback riding and rock climbing; spread it all over six days in the blistering Utah heat; and never stop to sleep. That's the punishing formula for the annual Primal Quest adventure race, considered one of the most extreme tests of human endurance. Of the 90 four-person teams that competed this summer, only 28 finished the course. "It was more like adventure torture," says Michael Tobin of the winning team.
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