Tough Mudder is an endurance event series in which participants attempt 10–12 mile-long (16–19 km) obstacle courses that test mental as well as physical strength.
It was co-founded by Will Dean, a former British counter terrorism officer, and Guy Livingstone, a former corporate lawyer.
The obstacles often play on common human fears, such as fire, water, electricity and heights.
The main principle of the Tough Mudder revolves around teamwork.
The Tough Mudder organization values camaraderie throughout the course, designing obstacles that encourage group participation.
Participants must commit to helping others complete the course, putting teammates before themselves, and overcoming fears. An average 78% of entrants successfully complete the course.