Runners from the West Coast took their bodies to the limit in the Hubert100 event last month.
Jared Webb, formerly of Mudamuckla, and Streaky Bay's Brooke Cupples entered the race at Wilpena Pound in the Flinders Ranges, taking on changing terrain and breathtaking scenery.
Mr Webb entered the full 100 mile race and did so as a tribute to his late cousin Brett Yeates, who passed away last November.
He raised more than $4000 for the Juvenile Diabetes Research Foundation, as his cousin was involved with the foundation having grown up with diabetes.
"I spent very little time with him since I joined the military so it was weighing heavily on my mind as I don't think I appreciated his impact on me as much as I should have," he said.
Mr Webb has been running for three years and after his first run said he "caught the bug", with the Hubert100 his 20th marathon.
He was at sea on a patrol boat for most of the year, so preparation involved doing as many laps of the ship as possible - he managed 4800.
Mr Webb finished the race in 33 hours and 30 minutes, with injury hampering his goal to finish in under 31 hours.
"The race was a lot of fun, I've never been out to Wilpena Pound before so I really enjoyed the scenery and my whole family came to watch and cheer me on so it was a rare experience to get everyone together," he said.
"I was keeping a great pace up to the 77km mark when I rolled my ankle - which later turned out to be a damaged ligament - and after that it was a matter of just trying to keep going.
"My goal going into the race was to finish in sub-31 hours so I could be back in time for dinner with my son on Sunday - it didn't work out but he was still happy to see me."
Ms Cupples trained for six months to prepare for the 100 kilometre distance, however her race was cut short by injury.
She said she went into the race with niggling injuries yet after training for such a long period wanted to be at the start line.
"I knew over the 100km distance that it would come about at some stage, but I wanted to start the race and see how far I could go," Ms Cupples said.
"I climbed St Mary Peak and was doing well, but at about the 25km mark I knew I wouldn't make it, and I pulled out at the 40km mark - at that point I was just shuffling along."
While disappointed to see her participation end after about five hours, Ms Cupples it was the sense of adventure which drove her to enter in the first place.
"It was a really big challenge and I wanted to see how far I could push myself," she said.
"I love adventure, I love the outback and I love running."
Her six months of training involved running five days a week, building her endurance and completing ever-increasing distances of running.
"It's about commitment to getting up every day and training over six months, and consistency, rather than how fast you are," she said.
She said nutrition training is also a big part of preparing for a race over that distance.
Having had her race cut short, Ms Cupples is determined to be at the start line and then see the finish of the event in 2020.