Then I watched the promo video. People think I do weird things sometimes (marathons, triathlons, multi-day backpacking or bicycling or horse riding trips), but even I haven't done anything as crazy as this!
The mud is nothing. Not only do you get to run through flames, there is a section of the course where you run through muddy ice water with electrically charged wires hanging down. People (and apparently in this case, Stable Boy) actually pay money to get shock treatments during the event. Up to 10,000 volts of electricity.
Check out the promo video below. Here is a link to the rest of the obstacles. http://toughmudder.com/obstacles/
I think we may need to change Stable Boy's name to Psycho Boy.