Personal trainer and marketing: strategies for client attraction and retention. Research, Society and Development, [S. l.], v. 11, n. 8, p. e41911830878, 2022. DOI: 10.33448/rsd-v11i8.30878. Disponível em: https://rsdjournal.org/rsd/article/view/30878. Acesso em: 5 dec. 2025.