My grandson (age 4) has just started karate or TKD or something of the sort. He was becoming very aggressive, especially towards his little sister, and daughter-child hoped this would help teach him discipline and self-control ..... and it seems to be helping quite a bit already. He doesn't tell us a whole lot about his classes and what he is learning but he just
beams when you bring it up. He is really enjoying it!
Congrats to your son for earning his Black Belt!
I hope your grandson enjoys this sport. Martial arts seem to stress self control, respect, and the children have fun while they learn. Keeps them in good shape too.