I was doing MMA classes upto a couple of years ago when I realised my 50 year old body just couldn't take it any more.
A large percentage of the class is fitness training and sometimes the instructer used to throw a big die with various exercises on it. I thought at the time if there was a better "game" to put the class through.
Maybe this is the market the OP could aim at
I think so too thanks. I teach, and i think kids would like doing this in gym class as well or as an extra activity.