A systematic review of the literature concludes that participation in physical activity has a statistically significant positive longitudinal relationship to academic performance in children: http://archpedi.ama-assn.org/cgi/content/abstract/166/1/49
While this review doesn't appear to consider the martial arts, other research shows that participation in a "traditional" martial art (e.g., Taekwondo as an inherent fusion of technique and philosophy) improves physical fitness as well as behavioral and psychosocial factors (see my article "Why Taekwondo?" at http://lifespantkd.blogspot.com/).
So, if you teach the art of Taekwondo to children, keep up the good work!
Cynthia
While this review doesn't appear to consider the martial arts, other research shows that participation in a "traditional" martial art (e.g., Taekwondo as an inherent fusion of technique and philosophy) improves physical fitness as well as behavioral and psychosocial factors (see my article "Why Taekwondo?" at http://lifespantkd.blogspot.com/).
So, if you teach the art of Taekwondo to children, keep up the good work!
Cynthia