My son, Daniel Haber finished Tough Mudder on Saturday. It's a 12 hour grueling experience that is an extreme endurance challenge. You can see the video all about Tough Mudder at www.toughmudder.com. He didn't train and says that if he does it again, he will. One of his Sigma Pi fraternity brothers who moved to Ohio asked him to sign up. You have to be tough and fit to finish this challenge.