Thirty-one school groups had registered this year and there was support from Sport Bay of Plenty, Rotorua Energy Charitable Trust and Rotorua Lakes Council.
"Without their support we couldn't put on an event like this," Chenery said.
"Look at the kids, they are absolutely exhausted. They have given it their all and they are still so stoked."
Image 1 of 9: Ratema Rika, 9, left, with his cousin and Mihikore Te Rangi, 10.
Rotorua triathlete and ambassador for the event Sam Osborne competed in a Weet-Bix triathlon when he was a kid.
"I was part of a team, I did the bike, I couldn't actually swim back then," he said.