Cassou, A. C., Fermino, R. C., Santos, M. S., Rodriguez-Añez, C. R., & Reis, R. S. (2008). Barriers to physical activity in elderly: an analysis with focus groups. Journal of Physical Education , 19(3), 353-360. Retrieved from https://periodicos.uem.br/ojs/index.php/RevEducFis/article/view/3675