When the United States was growing, men performed noble tasks like trekking the wilderness for new land or hunting wild game to feed their families. You too should feel the urge to tap into your manly ambitions -- you just lack the time of our forefathers. But if you're into sports like biking, skiing, or running, these intense races can serve as a way to feed your macho needs.

From the bright lights of Las Vegas to harrowing winter peaks, the following 10 endurance events embody the ruggedness that is manhood.

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