 This study examined the adherence of older adults to exercise programs. It found that the most common measure of adherence was dropout rate, which ranged from 65% to 86%. Supervised programs had higher adherence rates than unsupervised ones. Factors such as age, gender, socioeconomic status, health status, physical abilities, cognition, and depression were also associated with adherence. This article was authored by Alexandra Miranda Assumpcao Piccarelli, Leni Souza Maximo Pereira, Danielle Surinu Pereira, and others.