JUST LET THEM PLAY: AN EMPIRICAL DEMONSTRATION OF CUSTOMER RETENTION THROUGH GAMIFICATION IN MOBILE FITNESS APP. Lex localis - Journal of Local Self-Government, [S. l.], v. 23, n. S4, p. 2704–2722, 2025. DOI: 10.52152/a6jt5404. Disponível em: http://lex-localis.org/index.php/LexLocalis/article/view/800941. Acesso em: 13 sep. 2025.