This study provides baseline data on Pima children's school day physical activity participation from two Pima communities. Specifically, the authors were interested in how Pima children's SSC (school step counts) physical activity compared with children who attend public schools in large metropolitan areas. Findings suggest that Pima children appear to be more active during the school day than their public school student counterparts. There also appears to be physical activity participation differences across communities and schools. (Contains 1 table.)