Sanitarium Weet-Bix TRYathlon's 13 part series finished in Kawana with more than 40,000 kids taking part to smash the old world record 36,000.
Weet-Bix ambassador and six-time World Surf League champion Stephanie Gilmore was at the finish line to present participants with medals.
"I used to cherish my medals and ribbons as a kid and I just think it'd be so cool to do an event and have one of your heroes present you with your medal," she said.
"I think the coolest part about these triathlons is it's not a pressure atmosphere, it's not about winning, and it's just about being involved.
"Who knows, maybe they'll walk away and say 'hey mum I really want to start doing triathlons or I want to start swimming or riding', anything, it's just about participation, that's the key thing here."
Weet-Bix representative Sheree Dell said the second Sunshine Coast TRYathlon was a huge success with participation far exceeding last year's event.
"Sanitarium create these events to encourage kids at a young age to try activity in an environment that makes them feel really good about themselves," she said.
Courtesy of Sunshine Coast Daily