The video above has commentary by the two founders of Tough Mudder, who are also on camera as they describe their first ever event in May of 2010.

In just two years this start up has attracted 500,000 participants paying $90-200 each, depending upon when you sign up. This year there will be events in 28 locations. A great and growing success. You can learn more in yesterday’s post .

What’s more impressive to me is that Tough Mudder was founded by Will Dean and Guy Livingstone. Dean developed the concept while studying at Harvard Business School, where Tough Mudder was a finalist in the annual business plan contest. Wow! Those Harvard guys can really come up with some earth-shaking businesses: facebook, Microsoft, etc, etc…