I don't have a problem with it, as long as it is the person's choice. I'm involved in boxing and Muay Thai kickboxing. What upsets me is the 10-13 year old kids who are out there getting bloody. Sometimes I am not all that sure they are doing it for themselves. It seems like they're fighting to make their dads happy. Jaden watches me work out, so he always ask me if he can. I'd let him work out there when he's 8 or so but I wouldn't let him fight competitively until he was at least 13. There are a few kids that I work out with who's parents won't allow them to fight.