摘要
任何跑步比赛，只要你想，都可以把它变得富有挑战性。尽管如此，即使是最铁杆的跑步迷也希望来点新意思。以下这些比赛深受我们喜爱，还带有强烈的“你是开玩笑吧”的元素呢。
Any race can be as challenging as you choose to make it. Still, there are times when even the hardest of the hardcore[中坚分子] want to try something different. Here are some of our favorite races with a strong you＇ve-got-to-be-kidding-me element[元素].
