IMAGINE crawling through an underground trench, running up a slippery half-pipe they call Mt Everest, jumping off a 30-foot tower into a bath of mud, then following it up with an underwater swim in icy water.
After five-and-a-half hours of that, you have to run through a series of wires to get to the finish line, not knowing which wires are electrically charged.
That's just part of the challenge embraced by Lisa Greedy and three other Clarence Valley mums who took on the Tough Mudders event in Gosford on Saturday.
"When we were asked about giving it a go, we put our hands straight up," Greedy said.
"We started training in June for it and sacrificed more than a few Sunday sleep-ins, that's for sure."
She was part of the 22-strong Hybrid Fitness Gym team that completed the course with 25,000 fitness freaks from around Australia.
Thanks to their guts and determination, but most of all teamwork, the whole team managed to finish the course.
"It is definitely a team endurance event," Greedy said.
"You help each other out at different parts and we owe that to the three guys for getting us through.
"Every single one of us finished without any major injuries."
As they crossed the finish line with mouths full of mud, every participant was met with the sight of a registration stall for the next Tough Mudder event.
"When we got there, we looked at each other and agreed it was a once-in-a-lifetime kind of thing," Greedy said. "We talked about it the next day and we were all keen on going again.
"We owe Shaun Davison a lot for being able to finish it," Greedy said. "He gave up his Sundays free of charge for us since May.
"Without his help, there's no way we could've done it."