Tough Mudder - I covered first UK TM event of the season, down in Northampton. Crazy scenes ! If you are not sure, Tough Mudder is an endurance event series 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, and heights. The organizers encourage teamwork, and many obstacles are purposefully designed so as to be very difficult to complete alone. The events are untimed, but on average only 78% of entrants successfully complete the course. Images by event photographer David J Colbran, please do not use without permission.