The Tough Mudder, founded in 2009 by Will Dean and Guy Livingstone, is designed by British special forces and consists of a 10-to-12-mile trail run over rugged terrain featuring steep inclines, water hazards and military-style obstacles. Fitness, strength, stamina, mental grit and teamwork are a must.
Nov. 13, 2011 Participants run through dust at the start of the Tough Mudder at Raceway Park in Englishtown, N.J. According to the Tough Mudder Web site, founder Will Dean thought of the idea while at Harvard Business School. Michael Nagle/BLOOMBERG NEWS Buy Photo