| Summary: | Purpose Examine the efficacy of a virtually delivered, parent‐focused physical literacy (PL) intervention for early childhood called PLAYshop and examine the level of and factors that influenced implementation. Methods A randomized controlled trial was conducted with 122 preschool‐aged children (3–5 years) and their parents from western Canada. PLAYshop included a virtual workshop, educational and material resources, and follow‐up support via an app with four booster lessons (1, 3, 5, 7 weeks post‐workshop). Primary and secondary efficacy outcomes were measured at baseline and 2‐month follow‐up. Tertiary efficacy outcomes were also measured post‐workshop (intervention group)/1‐week post baseline questionnaire (control group). Tertiary implementation outcomes were measured via parental questionnaire and explored via parent and workshop leader interviews. Repeated measures Analysis of Covariance/Analysis of Variance and Generalized Estimating Equations were conducted. Results Intervention efficacy was not observed for children's PL (fundamental movement skills, motivation, enjoyment, confidence; primary outcome) or physical activity (PA; secondary outcome). Increases in other secondary and tertiary outcomes were observed in the intervention group, compared to the control group, including parent–child co‐participation in PA (partial η2 = 0.062), parental PA modeling (partial η2 = 0.049) as well as parental capability (partial η2 = 0.039), opportunity (partial η2 = 0.089), and motivation (partial η2 = 0.026–0.045) to support children's PL development. High usefulness (87%) and satisfaction (96%) were reported by parents. Several themes were identified supporting the implementation of the intervention. Booster lesson completion was low (17%–30%). Conclusion Efficacy was observed for some parent but not child outcomes. Implementation was highly feasible at the delivery level but parent engagement in boosters had challenges. Trail Registration: NCT05255250 (Version 1: February 24, 2022; Version 3: December 7, 2022)
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