What is the Tough Mudder

http://toughmudder.com/

Tough Mudder events are hardcore 10-12 mile obstacle courses designed by British Special Forces to test your all around strength, stamina, mental grit, and camaraderie. With the most innovative courses, half a million inspiring participants, and more than $2 million dollars raised for the Wounded Warrior Project, Tough Mudder is the premier adventure challenge series in the world.