Tough Mudder is an endurance event series in which participants attempt 10–12-mile-long (16–19 km) military-style obstacle courses. It was designed and created by two British Harvard Business School post graduates and tests mental as well as physical strength. 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. The first Tough Mudder challenge was held in the United States in 2010. To date, more than 1.3 million people worldwide have participated in Tough Mudder events.
