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.
He said he wanted to be an ambassador because it was great to see kids getting into the sport as early as possible.
"The more we can get at the base level, the more we'll see at a professional level."
He was joined at the finish line by fellow ambassadors former Silver Fern Irene Van Dyk and slalom canoeist Luuka Jones.
There were medals, apples, high fives, cheers and hugs from mums as the kids raced through.
Cohen Bourne, 8, said the day had been good and the bike was his favourite part.
