Jacek Wasik, Marta Motow-Czyż, Gongbing Shan, Marek Kluszczyński, Comparative analysis of body posture in child and adolescent taekwon-do practitioners and non-practitioners, Ido Movement for Culture : journal of martial arts anthropology : theory of culture, psychophysical culture, cultural tourism, anthropology of martial arts, combat sports, 2015, 15, 3, s. 8-21