A Dunedin runner and his daughter are out to smash a world record in Outram on Sunday.
University of Otago research fellow Dougal Thorburn, 31, and daughter Audrey, 2, will try to break the Guinness World Record for the fastest 10km run while pushing a pram.
The attempt will take place during the Hill Free 10km race, with a non-modified Chariot pram because the records had to be made on an officially measured course, using a commercially available pram, with a child inside.
Dr Thorburn was "pretty confident" he and Audrey would beat the 34min 19sec record set by Australian Russell Stokes in 2008.
In July, Dr Thorburn recorded an unofficial time of 33min 11sec.
The weather forecast for Sunday looked favourable, with little wind to hinder his run, he said.
A wheel puncture, an injury, or Audrey becoming too restless were the unknowns on race day, he said.
"I'm in good nick at the moment ... And [Audrey] is used to being in the pram. There's a 50 per cent chance she will go to sleep."
The run was also a celebration of the time spent exercising with Audrey and elder daughter Lucy (5).
"We've clocked up around 15,000km in the five years I have had the pram," he said. The run would also promote the benefits of sustainable transport, he said.
If he broke the record, he expected many retired runners to dust off their trainers and have a crack.