NZ Iron Strength is a strength gym and boxing facility at 2/42-44 Anzac Road in Browns Bay, North Shore. It offers 24/7 gym access, semi-private coaching, boxing and kickboxing classes, and an 8-week transformation challenge with three coached sessions a week, tailored nutrition and weekly check-ins. Memberships start from $24.95 a week, with no lock-in contracts, as at 2026. The facility has six zones: a strength area with racks and barbells, a pin-loaded machine area, a conditioning room with treadmills, bikes and rowers, a boxing room, a kids' room with toys and books, and mirrors for progress photos. Combat Training memberships include unlimited boxing and kickboxing classes, and gym members get a trial class. The gym limits memberships, so there is space to train.
Members praise the focus on technique, with coaches who watch and correct form closely. Several say the gym feels small, friendly and family owned, and one mum says the kids' room and mum lifting classes made it easy to return after having babies. A member who lives in Massey travels to Browns Bay for the value. Spots in the 8-week challenge are limited, and new applicants join a waitlist once it is full.