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Purpose: To examine the influence of individual participant, instructor, and group factors on participants’ attendance and adherence to community exercise classes for older adults. Design and Methods: Longitudinal data from 16 instructors, 26 classes, and 193 older participants within those classes (aged 60–100 years) were examined. Data were collected using questionnaires on individual participants’ demographics, attitudes, health perceptions and conditions, and group cohesion. Instructors’ demographics, training, background, experience, attitudes, and personality were collected. Group factors included class type, cost, transport, and whether the class was held in an area of deprivation. Outcomes (attendance/adherence) were collected through attendance records. Results: Multilevel modelling (MLwiN) revealed both instructor and individual participant variables were important in …