You’re standing in a huge field—maybe it’s at a park, a campground, or even the grassy expanse surrounding an airport. All around you are packs of mud-covered, grinning athletes. They’re climbing ...

To the uninitiated, running through one of Tough Mudder’s mud-soaked obstacle courses may seem like a trial for joining the world’s biggest frat race. More than 10,000 people may line up at any given ...

Under Armour is out as Tough Mudder’s official apparel sponsor, replaced by Merrell as both gear and presenting sponsor. That’s the first of two announcements the obstacle racing company recently made ...