Since 2009, the Kansas City Dirty Duo race has helped parlay mud into money for charity. Stretched across mostly flat terrain inside Kansas Speedway, the race sends teams of two biking and running around a course nearly six miles in length. Mystery obstacles add an extra challenge to each mile, and right before the finish line, there?s a massive 40-foot mud pit where teams can to play gloopy games of Marco Polo before completing the race. Kids as young as five years old can get in on the dirty dashing, too, by joining the one-mile Dirty Duo Jr. race. Once everyone has crossed their respective finish lines, the festivities continue with a post-race celebration featuring music, food, and cold refreshments.