Cameron is now 14 and has been representing New Zealand since he was 10.
"Competing is fun. I meet lots of new people," Cameron said.
His cousin Imogen Ear, 13, said: "Competing internationally was scary at first but when you get used to it, it's like, normal."
Sensei Craig Nordstrand said the results aren't the main goal for the club.
"These kids started between 4 and 9 years old and have been training with the club for years to reach this level," he said.
"It's not all serious training though, we do fun stuff like go away on camps and movie nights."
The club is running special classes to attract more beginners, for 4-7-year-olds on Mondays and Wednesdays, 8-12-year-olds on Mondays and Wednesdays and for 13+ on Tuesdays and Thursdays.
Craig Nordstrand said anyone who wants to learn more should call him on 021 223 3644.