The document discusses the importance of physical activity and physical literacy in early childhood development from ages 0-5. It notes that physical activity helps build brain structure which sets trajectories for lifelong health, learning, success and relationships. The core of early brain development involves connecting neurons and pruning synapses. Four developmental domains must be supported including emotional, social, physical and cognitive. Physical activity and literacy are important for physical and mental health as well as developing skills like coordination, balance and self-confidence. Early experiences can impact stress levels and brain structure. Providing nurturing environments, caring relationships and opportunities for physical activity across all developmental domains helps build strong brains.