The proposed research seeks to determine whether virtual coaching and social supportfocusing on key social cognitive factors will be an effective strategy for maintainingphysical activity (PA) after completing cardiac rehabilitation (CR). Despite thewell-documented benefits of CR, only 15-50% of individuals continue to exercise 6 monthsafter completing CR.4-6 Thus, after 36 sessions (typically 12 weeks), many patients areleft without the support necessary to sustain physical activity (PA) and prevent adversesecondary cardiac events. Though previous research has explored interventions to sustainPA after CR, many studies have been lacking in a theoretical basis, objective measurementof PA, measurement, and analysis of psychosocial and social cognitive factors, andlong-term impact on clinical outcomes. Low-cost, pragmatic approaches to maintaining PAafter CR is urgently needed for older adults, and virtual technologies offer promisingsolutions to promote adherence to PA. The three specific aims of the project are to: 1)determine the effect of virtual coaching and social support on adherence to PA (measuredby objective step counts) in the intervention vs. control groups; secondary measures willbe amount of sedentary time, functional fitness, and self-reported exercise; 2) determinethe effect of virtual coaching and social support on psychosocial and social cognitivefactors in the intervention vs. control groups; 2a) evaluate the extent to whichpsychosocial and social cognitive factors mediate the effect of the intervention on PAadherence; 3) examine differences in CVD risk factors (blood pressure, lipids, HbA1c,BMI) between groups.