Tough Mudder: Is this your idea of a good away day?
It is perhaps not everyone's idea of team bonding, or a great company away day, but the founder of Tough Mudder is banking annual revenues of more than $100m (£58m).
Last year, nearly a million people around the world paid up to $200 (£116) to run, jump, swim, crawl and haul themselves around a 10 to 12 mile military-style obstacle course.
In the events, organised by the New York-based firm, participants are confronted by icy water, mud, live electric cables and barbed wire.
Will Dean, Tough Mudder's founder and chief executive, spoke to the BBC's Aaron Heslehurst.
08 Jul 2014
- From the section Business