"It's the same type of moves but I'm stepping it up," he says.
Dew won't graduate to junior international level because he considers himself too old.
Besides, he will have other commitments when he leaves school.
"I want to have a life, work and school," says Dew, who intends to pursue tertiary education.
For year 11 pupil Coffey it was his first national bling in nine years of gymnastics.
"I'll take it as far as I can but I can't do junior international. It requires a lot hours and resources and you have to go to bigger cities," says a "very satisfied" athlete who got into the sport after because his mother, Dale, is a former gymnast.
Zethan, who has been competing for four years, tackled his first nationals and also had a go at parallel bars, floor, pummel, vaults and rings disciplines.
"I want to see how far I can go before I leave school," he says, revealing he followed his sister into the sport.
Omni coach Joanne Cox says the medals and Abigail's mark of proficiency are a testament to all the hard work they teenagers have been putting in throughout the year.
"It's a huge commitment so I'm very proud of them," says Cox who is intending to stand down as coach at the end of this year.
All the club's senior MAG gymnasts reached finals. Only one junior didn't.
The members also had to raise funds for the Invercargill trip, says Cox.