When my oldest son was a kid he had a pretty serious anger management problem. His counselor told me Tae Kwan Do would be good for him. It was...helped him develop some discipline as well as giving him some physical self-defense skills (he got picked on A LOT). It got to be too expensive so we had to take him out of the classes before he made it to brown belt (and he was close, too, dammit). But he did learn a lot and he still uses the knowledge to this day.