For most of the women it's their kickboxing fight debut, he said. A number of them are also petite fighters.
One of those fighters is Whangarei mother Amy King, who will be stepping into the ring for the very first time tomorrow, after doing kickboxing for less than a year.
In that year, she's managed to shed over 20kgs. "We call her the poster girl, who inspires all the newbies," Haenga said.
As well as fights there will be entertainment from a local dance crew, DJ, prizes, food and a bar.
It kicks off at 12.30pm tomorrow at the ASB Stadium, Western Hills Drive, Whangarei.
Tickets are available from Roundhouse Gym, and there will also be door sales.
Read about Amy King's journey in tomorrow's Northern Advocate.