Doing the majority of it with a broken arm would border on the unbelievable.

But that is exactly what Dubbo's Melanie Currey did recently at the World's Toughest Mudder in Las Vegas.

Currey made the trip to take part in the most demanding and gruelling event, in which competitors attempt as many laps of the five-mile course as they can in 24 hours.

"I didn't go too bad, I was well prepared but I did break my arm early on which made it difficult but it didn't stop me," Currey said.

"There was a four-metre wall with a peg board you had to climb and at the top a gentleman went over the wrong way and fell on me and we toppled down."

Despite that seemingly major setback, Currey continued on and had just about completed her sixth lap by the time the 24 hours was up.

The Dubbo fitness fan has taken part in obstacle races and 24-hour events all across Australia but she admitted this one, contested in the deserts of Las Vegas, was the most difficult.

Saying "it was just an achievement to finish", Currey's description of the course gave an idea of how much of an incredible physical effort it was.

"I was lucky because it began on Saturday afternoon about 2pm and it was hot. I'd trained in that here at Dubbo, but some people struggled with the dry heat," she said.

"It was good for me but at night it got down to about four degrees (Celsius) and you were going in and out of water and some people got hypothermia because it was so cold.

"The most difficult part was probably the cliff jump. It's an 11-metre cliff and it only opened after midnight so you're jumping into the dark. I'm not great with heights so that was scary because you feel like you're falling a long way before you hit the water."

While some may struggle with the idea of putting their body through such an ordeal, Currey loves it.

From competing locally at Dubbo, Currey's passion has led her all across the country and now across the world.

"I was training with an ex-army guy and he set a few of us a challenge to go in a tough mudder but by the day it was on I was the only one who hadn't pulled out," she said.

"It was my first obstacle race and I was hooked. Since then I've done Spartans and Aussie Titan races, 24-hour races and events all over Australia.

"I love the community of it and you meet like-minded people and I've never been in a sport where it's so supportive and where you make friendships.

"I also always told my children you can do anything you put your mind to so after they grew up I've been able to show them that."