Just ask him what his expectations were for the National All Styles martial arts championships in Melbourne on the weekend.

"I wanted to win," he said. "Bad."

He was able to win twice, earning the tag of national champion in both the kata and creative kata divisions.

"It was just a really good feeling," he said.

"I can't really describe it."

The 16-year-old's desire for victory was proved by approaching his Funakoshi Karate Australia coach Frank McKenzie about three months ago in the lead-up to the state titles.

"He helped me with my kata and a bit of kumite," Josh said.

"I'm really grateful because I wouldn't have been able to do this without him."

The duo had one-on-one sessions on Saturday mornings.

They added to Josh's one to two hours of training on Mondays, two hours of coaching on Tuesdays and Thursdays, one hour practice on Thursdays and two to three gym sessions per week which helped him with his speed and power.

The championships attracted more than 600 competitors from five states.

Josh was one of about 40 people vying for a kata title on Saturday.

His performance earned him scores of 7.35, 7.40 and 7.23.

"I was very happy and thought I would be in the top three at least," the junior black belt holder said.

He couldn't recall his scores for the creative kata division but remembered he felt similar to how he did after he learnt his kata scores.

The two national titles were a career highlight for the teenager.

He rated them alongside being judged the international grand champion in Warrnambool two years ago and taking out the kata title in South Africa last year.

Next for Josh is some time away from competition while he focuses on trying to gain his senior first dan.

"I was surprised I got asked because most people don't get asked until they're 18 years or over," he said.

"At the time of grading, I'll only be 16."

Achieving the feat won't be easy, with aspirants needing to produce a 20-page assignment and undergo a practical exam.

Two other south-west juniors placed at the national championships on the weekend.

Nirranda's Sonia Morey finished third in kata while Matthew Conroy, of Camperdown, came second in point sparring.

Camperdown Funakoshi Karate instructor Peter Conroy also competed but did not place.

SUBS note: pic booked in for 5.30pm