The onset of retirement and children leaving the family home may offer a "window of opportunity" for individuals to influence regular moderate- to vigorous-intensity physical activity; therefore, this study examines the feasibility of a moderate- to vigorous-intensity physical activity intervention among recently retired participants (RET) and parents (P) with children who recently left the family home. A total of 46 inactive RET and nine inactive P were randomized to a 10-week web intervention (n = RET = 25/p = 4) or waitlist control (n = RET = 21/p = 5). Intervention techniques followed the multiprocess action control framework. Enrollment (37.5% for P; 40% for RET), retention (89% for P; 83% for RET), and satisfaction were high. One hundred percent of intervention-sectioned participation increased moderate- to vigorous-intensity physical activity compared with 52% of controls; large effect size differences were observed for key multiprocess action control constructs. Participants were highly satisfied with the intervention; however, recruitment challenges of P support moving to a randomized controlled trial for only the RET group.

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