Hello, I've been doing kickboxing at my Y for about 6 months now.  We use the bags and we are taught kicks, puches, and some self-defense moves.  I really enjoy this class.  I would like to take a class at a school so I can earn belts.  I'm not interested in fighting just learning the techniques of the art.  I'm in my late 30's, overweight and I have a bad knee, so I really don't want to go to a class and get my butt kicked first day.   I just don't know which class to take, there are so many, karate and tae kwon do are the most popular I guess but if anyone has a suggestion I would be greatly appreciative.  Thanks.