And I would say, offer real full contact sparring. Hard contact hard training. It could be separate class. I myself find this what brings adults to boxing or mma. Classes that teach real fighting, not games for kids. Yeah you might get few parents to join with their kids, but they will mostly stop training after a while, and definately when their kid stops. And people who want to learn how to defend and fight will look for something different than just doing basic drills, sparring with no contact or doing standing joint locks on unresisting opponent.