Tough Mudder is an endurance event in which participants attempt 10–12 mile long military-style obstacle courses.

Designed by British Special Forces to test mental as well as physical strength, obstacles often play off of common human fears, such as fire, water, electricity and heights. The organizers encourage teamwork, and many obstacles are purposefully designed so as to be very difficult to complete alone.

This was completed in September 2013 – in a suit jacket!