@article{harris_ferreira_resende_silva_2020,  title={FREE EXERCISE PROGRAMS FOR THE ELDERLY: A SYSTEMATIC REVIEW ON ADHERENCE AND ABANDONMENT},  volume={31},  ISSN={2448-2455},  url={https://doi.org/10.4025/jphyseduc.v31i1.3149},  DOI={10.4025/jphyseduc.v31i1.3149},  journal={Journal of Physical Education},  publisher={Universidade Estadual de Maringá},  author={Harris, Elizabeth Rose Assumpção and Ferreira, Flávia Porto Melo and Resende, Helder Guerra de and Silva, Nádia Souza Lima da},  year={2020},  pages={e3149} }