"One day I'd like as many stripes on my belt as senior instructor has got," Baxter said.
That number of stripes is four and they have taken Craig Thompson 23 years to achieve.
"I like the fundamentals and I enjoy all the classes," said Baxter.
"We use the mental side of it in everyday life. Everyone should do tae kwon do. It helps with discipline."
The fundamentals are breath control, calm mind, concentration of power, balance, speed, reaction and force. Classes in Rotorua are held twice a week at Owhata Primary School Hall. The Johnson-Ronalds have attended all bar one since it was founded in the city in May 2011.
"And that was only because the car wouldn't start," said dad Rob Ronald.
He saw a brochure advertising the start of classes and decided to take his three eldest kids to see if it was something they would enjoy.
"We came along, liked it and stayed. The kids love it."
He said Feast Tae Kwon Do secretary general Ben Caldwell was an unsung hero in the city, travelling twice a week from his Morrinsville home to instruct the classes with Thompson.
Thompson said he was proud of the siblings for what they have achieved in the sport so far.
"You don't see a lot of young ones go for their black belts," he said.
"You need a lot of support from parents and that helps. Feast Tae Kwon Do isn't practised for the sport; it's for the art. It's not competitive, which is quite unusual.
"It's probably the only one around that doesn't do it for the competition. It makes you look at yourself, rather than at other people."
Feast Tae Kwon Do is at Owhata Primary School Hall on Thursdays from 6.30pm and Sundays from 6pm.
Go to www.rotoruadailypost.co.nz for a video.