It's unlikely many people would have the stamina or the sheer guts to complete a triathlon and continue running 15 kilometres past the finish line.
But that's what Canberra's very own Forrest Gump, Andre Carvalho, plans to do on Sunday at the Triple Edge Endurance Triathlon in Canberra.
He will swim four kilometres, cycle 120 kilometres, and then run an impressive 45 kilometres.
Adding the extra distance is part of the ANU research fellow's aim to run 12 marathons in one year.
Why set such an enormous challenge?
Because he was inspired by a stranger's speech who had breast cancer.
He was touched by the story the woman told at a race event he had undertaken, and although he did not know her, he decided that he had to help.
"I was driving home and I wondered to myself how I could help, but I wanted to do something that I knew I would never usually do," Mr Carvalho said.
"I had run a few marathons before, but nothing like this, and I went home and told my wife my plan, and she said 'Are you sure?'."
He was determined.
So far, Mr Carvalho has raised more than $3000 for charity Can Too, a health promotion foundation that raises funds for cancer research through relationships with Cure Cancer Australia and Cancer Council NSW.
This amount had been building over the six marathons he had already completed, including three in Canberra, and others in Spain, Brazil, and Batemans Bay.
The route for his July marathon ran from Yerrabi Pond to Lake Burley Griffin, with two steep climbs of Black Mountain and Mount Ainslie.
But with six marathons to go, Sunday's trying journey will be the hardest one he would have ever attempted (and may ever attempt). He will daringly add an extra 15 kilometres to the Triple Edge Endurance Triathlon to knock off his December run.
Mr Carvalho said while he was feeling excited he was also dreading the race.
"The longest event I've done was 49 kilometres, and my fastest was three hours and 19 minutes, but I'll take my time for this one."
"For training, currently I'm doing at least two swims a week, two rides and two runs a week, and I usually add at least one or two other sessions."
Mr Carvalho had not spoken to the woman who inspired his mega-challenge, but said almost everyone in the community knew someone who suffers from, or had suffered from, cancer.