Masterton's Rima Mururai has a simple answer when you ask what on earth made him decide to enter an endurance event labelled as "probably the toughest on the planet".
The aptly-named World's Toughest Mudder was held in New Jersey, New York, in November and Mururai, 33, was part of the Kiwi Cuzzies combination.
They came 19th out 30 finishers in the team competition after covering 80km during a 24-hour period.
"It's the challenge, that's what does it for me," Mururai said. "It's putting everything on the line, physically and mentally."
Saying this obstacle race is not for the faint-hearted is a gross under-statement.