A semistructured preschool motor program was developed in response to the paucity of evidence-based motor programs for preschoolers with disabilities in inclusive classrooms. A randomized controlled trial (RCT) was undertaken to examine the impact of the CHildren in Action: Motor Program for PreschoolerS (CHAMPPS), a 21-week intervention that includes 42 Universal Design for Learning–embedded lessons with suggestions for supporting school readiness skills. Eight intervention and 8 control classrooms across 2 states participated in the RCT. Data on 51 children with disabilities provide initial evidence on how CHAMPPS positively impacted children's active engagement, motor, and social development. The promising results include gains in motor skills, sustained physical activity levels during motor play, increased on-task behavior, and high feasibility and usability ratings by teachers. Implications for practice and future research are discussed. (author abstract)