Gomes, Lúcia, João Martins, Madalena Ramos, and Francisco Carreiro da Costa. “Niveles De Actividad física De Adolescentes Portugueses En El Primer Periodo De Confinamiento Por La Pandemia De COVID-19 Y Las Primeras Actividades De Profesores Y Entrenadores: Un Estudio transversal(Physical Activity Levels of Portuguese Adolescents in the First Period of Confinement Due to the COVID-19 Pandemic and the First Activities of Teachers and Coaches: A Cross-Sectional Study)”. Retos 47 (January 2, 2023): 701–709. Accessed June 10, 2026. https://www.revistaretos.org/index.php/retos/article/view/93923.