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This study examined differential trajectories of exercise-related self-efficacy beliefs across a 12-month randomized controlled exercise trial. Previously inactive older adults (N= 144; M age= 66.5) were randomly assigned to one of two exercise conditions (walking, flexibility-toning-balance) and completed measures of barriers self-efficacy (BARSE), exercise self-efficacy (EXSE), and self-efficacy for walking (SEW) across a 12-month period. Changes in efficacy were examined according to efficacy type and interindividual differences. Latent growth curve modeling was employed to (a) examine average levels and change in each type of efficacy for the collapsed sample and by intervention condition and (b) explore subpopulations (ie, latent classes) within the sample that differ in their baseline efficacy and trajectory. Analyses revealed two negative trends in BARSE and EXSE at predicted …