Among those who have caught the Ironmaori bug is Feilding mother of six Fontayne Davidson, who will tackle the run/walk, having "pounced on the opportunity" when her partner's sister suggested it in July.
"I never thought I would do anything like this while I was unhealthy for years after having all the kids my energy was low and I lacked motivation," she said.
"I often had thoughts of how fit and sporty I was when I was a young woman and that made me build the confidence to find that fire again and to be a example for my children."
She's only recently started training, walking 7km a day and deciding to step it up with box-fit training.
"I could only run for one minute before my knees would feel the impact of my weight and my breath would run out," she said. "Since then I can now jog 1km without stopping so my plan is to run and walk.
"I was quite a lot heavier than I am now although I would love to just wake up and I'm in my youth body again," she said. "But hard work is the only way to lose the kilos."
In recognition of the success of Ironmaori and its health-driven ideals, founder Ms Skipworth received a Blake Leader Award from the Sir Peter Blake Trust in 2011, Triathlon New Zealand's Outstanding Contribution to Triathlon in Schools award in 2013, and a Queen's Service Medal (QSM) in the 2014 Queen's Birthday Honours.