Tough Mudder is an endurance event series that features obstacle courses designed to test physical strength, mental grit, and teamwork. Participants navigate through various challenges, including mud pits, climbing walls, and electric shocks, all while working together to complete the course. Founded in 2010, Tough Mudder events are held in multiple locations worldwide, attracting individuals and teams of all fitness levels. The emphasis is on camaraderie and personal achievement rather than competition, making it a unique experience for those looking to push their limits and have fun in a challenging environment.