KERRY Williams has seen it with her own eyes for the last two years.
And with the Elephant Trail Race set to head into its third year in the Cairncross State Forest this weekend, the race organiser believes this year's event could be the most memorable.
The Ultra Trail Run course is 25 to 27-kilometres long with about 1455 metres of elevation.
"There are a lot of crazy people out there," she said.
As the COVID-19 pandemic continues on, Williams said the chance to push yourself to the limit could be just what all competitors need.
Just them, their thoughts and a lot of rugged terrain.
"The biggest thing people have told us is it's the most brutal running course in Australia," she said.
"It's so rewarding when you get to the end because there are different parts where you keep grinding and have to go through a whole rollercoaster of emotions.
"A lot of people need it for their mental health at the moment; the whole world has changed, we don't have a normal anymore so we need something that seems like normal."
Williams said they persevered with getting the race up and running for the last four months because "the area really needs it for tourism"."
"After six months of bushfires we didn't want to give up; we have been fighting for four months jumping through hoops," she said.
The standout part of the course is a near one-kilometre section aptly named Death Valley.
"It's 700 metres down and then back up of over a 47-degree incline which will sort people out," Williams said.
Racegoers will face numerous physical and psychological challenges while they're out there.
"There's a difference for everyone; it depends on your ability and how far you want to go out of your comfort zone," Williams said.
"It's the challenge of the distance, not the distance itself because of how the races are set up.
"The course is so hard."
The sight of runners collapsing on the ground upon reaching the finish line has quickly become synonymous with the previous two races.
"A lot of people don't realise how tough it really is until they're out there," Williams said.
Racing starts from 8pm on Friday night.
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