"Skateparks are often dominated by skateboarders but now the parks are filling up with roller skaters - it's a new community," said Samara, whose skating chews through a pair of stoppers each month.
Onerahi mother of three Haylee Thorn, known as Hailstorm, is a regular at the Riverside park and one of the first of the Northland team to "hit the bowls" this year.
"It's the adrenalin. I love that I can push myself beyond boundaries," she said.
"It's fun, it's stress relief ..."
Carl Mansel, whose derby name is Husslr, has just returned from playing at the Australian Men's Roller Derby first tournament for men.
New Zealand's men's team, Manawatu Roller Derby, beat Perth Mens Derby for eighth position.
The tournament was held in Brisbane where they skated in 42C heat on the flat track at Ipswich Showgrounds.
Husslr is also a keen skatepark roller and says more blokes should try it out.
The roller derby season might have ended, but the Northland team will continue training until December, with skatepark visits all part of fun and a way to boost fitness and skills through the summer. The team trains at Portland Recreation Centre and have their bouts at ASB Stadium throughout the year, as well as visiting challenging teams throughout New Zealand.