There are 13 Weet-Bix Sanitarium Kids' TRYathlons scheduled for towns and cities around New Zealand, but so far the Wellington event is the only one where entries have had to be closed early.
On Sunday, 1800 7- to 15-year-olds ran and biked around the Hutt Rec and swam lengths in Huia Pool. The "sold out" signed went up on the registrations website nearly a fortnight ago.
Sporting celebrities including multi gold-medal winning Paralympic swimmer Sophie Pascoe, Silver Fern Anna Harrison and top triathlete Aaron Barclay joined the local crowd by cheering the kids on and handing out medals at the finish line.
Sanitarium spokesperson Pierre van Heerden said it was a fantastic morning. "It was great to see kids giving the TRYathlon their best shot and trying for a personal best."
For siblings Eva, 10, and Thomas, 8, Wilson it was the second time they'd entered as a team.
Their mother Jo said Eva has a heel problem and it can hurt to run and cycle but she's a strong swimmer. Her little brother Thomas, however, is not fond of the water but loves to run and pedal.
They enjoyed last year's event, and crossing the finish line together again on Sunday (members of teams are allowed to join the runner for the final 100m sprint) and then collecting their medals was satisfying.
Mrs Wilson said truth be told they could probably both manage the TRYathlon as individuals, but when she put that option to them "they just looked at each other and smiled.
"It's a nice change from squabbling!"
Lance Rangi and Lisa Ramanui's daughter Maia, 11, is getting quite a taste for multi-sport.
Lance took part in the IronMaori triathlon in 2011 as a member of a family team, and last year as an individual. Maia, who would go out on training runs with her dad to show support, and also swim circuits of Aotea Lagoon, took part in last year's IronTamariki - and even won a mountain bike.
She rode it for 8km in Sunday's Tryathlon and also finished the 200m swim and 1.5 km run with ease.
Lance and Maia will be back in the Hawkes Bay for this year's IronMaori and IronTamaraki and this time they look to have reeled mum in too, with Lisa planning to have a go for the first time.
- Hutt News