Activities like tae kwon do, kung fu and aikido are a fun way for both boys and girls to achieve fitness and focus. Some parents may think they also promote violence, but that's a myth, according to experts. The martial arts actually help teach self-discipline and socialization skills. In fact, many parents whose children have attention-deficit/hyperactivity disorder (ADHD) report great success with these programs because self-control and concentration are exactly the skills underdeveloped in ADHD kids