S11-1: The Effectiveness of a Whole System Approach to Improve Physical Activity of Children Aged 5 to 11 Years Living in Multi-Ethnic and Socio-Economically Deprived Communities. Baltic Journal of Sport and Health Sciences, [S. l.], v. 5, n. Supplement, p. 268, 2026. DOI: 10.33607/bjshs.v5iSupplement.2034. Disponível em: https://journals.lsu.lt/baltic-journal-of-sport-health/article/view/2034. Acesso em: 21 aug. 2026.