S11: What Makes a Whole System Approach to Improving Physical Activity in Children and Young People Effective and Impactful? A Case Study of the JU:MP Intervention. Baltic Journal of Sport and Health Sciences, [S. l.], v. 5, n. Supplement, p. 267, 2026. DOI: 10.33607/bjshs.v5iSupplement.2033. Disponível em: https://journals.lsu.lt/baltic-journal-of-sport-health/article/view/2033. Acesso em: 21 aug. 2026.