“…Each organized group setting meeting is a dynamic social system with variability in group PA across meeting time. 1,[10][11][12] Total meeting time, defined by meeting start and stop point boundaries, can be time-segmented into smaller stable units, labeled sessions, based on naturally occurring changes in the social system, such as changes in task/purpose (eg, academic, PA) [13][14][15][16][17] ; location (eg, indoors, outdoors) 18,19 ; and member arrangement (eg, small group, whole group). 18 Sessions with a PA purpose can be further time-segmented into smaller units, labeled episodes, based on changes in task/purpose (eg, warm-up, skill drill); member arrangement; and setting demand (ie, whether exclusion or participation of all children in the setting is fostered).…”