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The purpose of this study was to determine if children engaged in equal amounts of physical activity during an established gross motor skill intervention (the Children’s Health Activity Motor Program (CHAMP)) and outdoor free play.

Cross-sectional study; sample: Ninety-nine children (Mage = 4.21, 51% boys) were randomly divided into two movement environments: CHAMP (n = 55) or control/outdoor free play (n = 44).

Physical activity was assessed using GT3X+ Actigraph accelerometers worn on the waist across four mornings. Average physical activity across the four days during either CHAMP or outdoor free play was extracted and categorized as light, moderate, vigorous, or MVPA. Physical activity data were reduced in the Actilife software using the cutpoints from Evenson et al.

A 2 (treatment) x 2 (sex) mixed measures ANOVA was used to compare the amount of time children …