Correlation between Physical Activity and Happiness: A Cross-Sectional Study in Medan. Sumatera Medical Journal, [S. l.], v. 9, n. 1, p. 18–25, 2026. DOI: 10.32734/sumej.v9i1.17213. Disponível em: https://idjpcr.usu.ac.id/smj/article/view/17213. Acesso em: 4 feb. 2026.