I’ll see your 29 mile run and raise you a burro. Wait! What? Welcome to the world of George Zack, an accomplished Burro Racer. Running with a burro might sound funny, okay, it totally is, but for over 60 years the folks in Colorado have taken this sport seriously amid a cornucopia of “ass” jokes. Which smells worse after the ultra, the donkey or the runner? Find out, now.

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