Pecan nut farmer Phil Robinson and exercise physiologist Simon Turnbull, both keen ultramarathon runners, will begin their 24-hour effort before sunrise Saturday on the mountain’s eastern track.

Mr Robinson lost two children, six-month-old Daniel and Hayley, almost five, to cystic fibrosis.

“There is not a day go past when I don’t think about my kids,” he said.

The trek is Mr Robinson’s way to raise as much money and awareness as possible for Cystic Fibrosis ACT & NSW. Cystic Fibrosis ACT & NSW has a vision of people living lives unaffected by cystic fibrosis.

Its mission is to improve the quality of life for people with the disease and their carers, with a goal to provide support services, education and research.

Cystic fibrosis primarily affects the lungs and digestive system because of a malfunction in the exocrine system.

Meanwhile, Mr Robinson admitted being able achieve their goal in the time period was going to be a challenge.

The pair will complete as many laps of the mountain as possible in 24 hours to the equivalent of Mount Everest in vertical metres.

“My personal goal is I’d like to say I’ve done the equivalent of Mount Everest in a day but that is kind of secondary,” he said.

The cause also has personal meaning for Mr Turnbull whose niece has cystic fibrosis.

People can support the cause at https://give.everydayhero.com/au/team-kristie, as the pair’s effort is linked to Kristie Neilson’s fund-raising campaign, or https://give.everydayhero.com/au/simon-23#post_274499