A Mobile App to Improve 24-Hour Movement Guideline Adherence in Preschoolers

The Shining Star mHealth App Intervention is a 12-week mobile health program designed to improve adherence to the 24-Hour Movement Guidelines (physical activity, screen time, and sleep) among preschool-aged children (3-4 years old). The intervention delivers weekly behavior-related goals and educational lessons to parents through a mobile app, including concise messages (\<500 characters) and links to additional resources. The app also includes gamification features, behavior trackers, and a \"Kids Corner\" for child-friendly content. Parents receive reminders and can engage with other participants through an optional chat forum.