AI-Based Personalized Exercise Prescription Through Mobile Health on Physical Activity and Health Outcomes in Older Adults: A Feasibility Study

Inclusion Criteria: * Be aged 65 years or older. * Own a smartphone (Android or iOS) compatible with study applications. * Have reliable access to the internet or Wi-Fi. * Demonstrate basic digital literacy sufficient to operate a smartphone (e.g., ability to open applications, navigate simple interfaces, and follow on-screen instructions), with or without initial guidance from the research staff. * Be able to safely engage in physical activity, as determined by the Physical Activity Readiness Questionnaire for Everyone (PAR-Q+) or physician approval if indicated. * Report engaging in less than 150 minutes of moderate-to-vigorous physical activity (MVPA) per week. * Be able to communicate in English sufficiently to complete study procedures and assessments. Exclusion Criteria: * Are younger than 65 years of age. * Do not own a compatible smartphone (Android or iOS) or do not have reliable internet/Wi-Fi access. * Are deemed unable to safely participate in physical activity based on the screening process (including PAR-Q+, STEADI, and research staff assessment), or do not obtain required physician clearance when indicated. * Currently meet or exceed 150 minutes of moderate-to-vigorous physical activity (MVPA) per week. * Are unable to communicate in English sufficiently to understand study procedures, provide informed consent, or complete study-related assessments. * Have any medical, physical, or cognitive condition that, in the judgment of the research team, would make participation unsafe or prevent completion of study procedures.