Early career professionals (ECPs) are a critical target for physical activity (PA) promotion. Affect contributes to an established PA intention-behaviour gap and is pertinent among ECPs. OBJECTIVE: The purpose of this study was to examine the feasibility and acceptability of a web-based intervention and explore the effects on secondary outcomes (moderate-to-vigorous PA (MVPA), emotion regulation, multi-process action control constructs). METHODS: Adults aged 25 to 44 who were employed at least part-time in a desk-based job and not meeting PA guidelines (< 150 min MVPA) were recruited and randomized into a 6-week online intervention integrating acceptance and commitment principles and affect regulation strategies, or a control group. RESULTS: Forty adults were recruited and randomized to the web-based intervention (n = 21) and waitlist control (n = 19). The recruitment rate was 29%, retention was 75%, engagement was 68%, and satisfaction was high in both quantitative and qualitative assessment. Participants allocated to the intervention improved MVPA (etap2 = 0.30), emotion regulation (etap2 = 0.49), behavioural regulation (etap2 = 0.53), affective attitude (etap2 = 0.23), identity (etap2 = 0.24), and constructs of mindfulness (etap2 = 0.44), and valued living (etap2 = 0.20). CONCLUSIONS: Primary outcomes concerning feasibility were adequate and secondary outcomes improved, suggesting a full-scale randomized controlled trial is feasible with minor modifications. A large-scale study is warranted to establish intervention effectiveness.

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