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Purpose: The aims of this study were to describe participants' demographic characteristics by adherence levels and to examine the association between participants' baseline physical function and their adherence to an evidence-based group exercise program., Design: A prospective exploratory study (N = 36,373)., Methods: Participants' physical function was assessed using 30-second chair-stand, arm-curl, and 8-foot up-and-go tests. Adherence was calculated as the proportion of attended sessions over offered sessions., Findings: Participants' mean adherence was 52%. Older male, Asian/Pacific Islander race, and Washington State residents with fewer chronic conditions showed higher adherence. Multinomial logistic regression showed the baseline 30-second chair-stand, arm-curl, and 8-foot up-and-go tests significantly predict adherence levels after controlling for demographics., Conclusions: Stronger upper- and lower-extremity strength and better walking balance and mobility are associated with higher adherence to exercise programs in older adults., Clinical Relevance: The results underscored the importance of offering classes at various physical function levels while considering participants' individual needs.