"That's pretty good, considering when they have the national gathering they have around 50 or so."
The male-dominated sport was open to females as well, and Mr Schipper said they stressed that point.
"If you get the technique right you don't need so much strength, but there are things like pulling yourself up a wall, it's all about the muscle."
Mr Schipper said they had had some injuries over the weekend, but these mainly happened while inside.
"It's that false sense of security," he said. "Outdoors you pretty much don't do anything, unless it's in your limit or just beyond."
During their parkour session at the Wanganui Boys' and Girls' Gym Club one man had dived too far and kneed himself in the mouth, he said.
Injuries happened when people were "being silly and mucking around".
Mr Schipper said he'd "99 per cent confirmed" a new parkour class starting at the Gym Club, and encouraged Wanganui residents to keep an eye out for it.
His youngest student is 10, and his oldest is 27, but Mr Schipper's two children, aged 7 and 4, were also learning parkour.