"The purpose of the event is to give people the opportunity to step outside of their comfort zone, do something active and crazy and awesome," said event spokesperson Greg Bostrom.
Around the 3-mile mard, things really start heating up.
Runners have to leap over logs of fire.
"I had to take a pretty good leap to get over it," said runner Jessica Melkner. " And, the smoke it probably the hardest thing."
Runner Jessica Geurra said, "It was hotter than I expected. But, you're not really thinking about the danger when you're out there. You're just having fun."
To cool off, athletes then take a swim in a mud pit.
"Oh, the mud was awesome," said runner Laya Ecob. "I loved getting down and crawling. I felt like I was in the military or something."

"And, there's no way to walk out clean," said runner Gloria Hein. "You're chin-deep in mud. It's awesome."
And, after you roll around in the mud, runners didn't have to worry about getting their cars dirty. They just took their shoes off and threw them in the pile."
"Green Sneakers is an awesome partner with us," Bostrom said. "They take these muddy, used shoes, clean 'em up and donate them to third world countries and families in need in the U.S."
Green sneakers expects to collect more than 176,000 pairs of shoes this weekend.
"Trying to work for a good cause is a good thing," said Hein. "So, I think not only do we have fun and good exercise, but then we get to donate our shoes. It's great. It's a win, win."

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