It's not quite the 12 labours of Hercules, but then he didn't have to endure electric shocks or walls of fire.
When Jonathan Pang tackles the Men's Health Survival of the Fittest 10km assault course in November, it will mark the end of a gruelling quintet of endurance events in which he's competing to raise money for a youth homelessness charity.
Before then there's the small matter of the Richmond half marathon in March, the Edinburgh marathon in May and October's Tough Mudder obstacle course, with its masochistic-sounding hurdles involving flames and live wires.
That's not to forget the 5.6km JP Morgan Corporate Challenge in July, though the 26-year-old, of Spring Grove Crescent, Osterley, nearly does, dismissing it as 'a dash to the pub'.
This is a man who before this year had never run further than 5km, but he's spurred by the desire to beat his £500 fundraising target for Centrepoint.
The charity helps 6,000 homeless people aged 16 to 25 every year, providing them with a safe place to stay, helping them tackle physical and mental health problems and supporting them back into education or work.
He chose to raise money for it after reading an article which said many young people feel they don't have anything to live for.
"When I was at school (at Isleworth & Syon School for Boys) I didn't do well in my GCSEs and A-Levels so I didn't have many qualifications. When I got into university I got a new lease of life and a second chance at education and went on to get a first class degree and a master's degree," said Mr Pang, who works in IT for asset management company M & G Investments.
"A lot of people are not as lucky as I was in terms of having a caring family that gave me the encouragement to fight again. I think 16 to 25-year-olds are a forgotten demographic, so I want to do everything I can to help."
It is the marathon which holds most fear for him, despite the tough obstacles awaiting him later in the year.
After a strong start to his training he suffered an injury, putting himself out of action for weeks, and throwing his schedule off course.
"The marathon seems so close and I'm getting a bit worried about that. I'm actually really looking forward to the Tough Mudder, but maybe that's because it's so far away," he said.
"I've had a mixed reaction from friends and family. Some people think I'm a bit mad while others think I can actually do it."
* You can sponsor Jonathan at www.justgiving.com/jonathanpang or by texting FOUR55 and the amount you wish to donate to 70070.