My son is nearly 25 so I don't have anything like that handy, but I do know that martial arts training can be both fun and helpful in developing body and emotional control - particularly things like Ju Jitsu or Tae Kwando.

If you aren't already (you probably already are) read to them a lot. I know it's one of the best ways to get kids interested and comfortable around words, and books, and to have them be motivated to learn to read for themselves.