The Mud Games, Minneapolis

The Mud Games, an exceptionally muddy merger of obstacles and distance, challenges participants of all ages and fitness levels to eschew traditional races in favor of a down-and-dirty good time. At the start of each heat, 200 runners hurl themselves into 3.1- or 1.5-mile courses strewn with sloppy bogs, rope webs, walls, and a mud slide. To keep racers on even terms, the organizers have sprinkled in a handful of mystery obstacles, which may include anything from waist-high water trenches to nephews who need help with their algebra homework. Prizes are awarded for the top three male and female finishers.

But the race isn't just for the sake of getting dirty. It was also started for charitable reasons: the majority of the proceeds go to the Children's Hospitals and Clinics of Minnesota, with additional funding given to the Minnesota Heat youth basketball association. Interested runners can register as individuals or teams, and friends and family are encouraged to come out as spectators and cheer them on.