This document provides information about motor development in children and guidelines for physical exercise at different stages of growth. It discusses the stages of motor development from infancy to adolescence. Gross and fine motor development are described. Factors that influence motor development include heredity, environment, nutrition, opportunities, and disabilities. Guidelines for exercise are provided for each stage from infancy through adulthood. Benefits of physical exercise for children include building muscles, boosting energy, and improving coordination. Weight training can build strength but requires supervision to prevent injury.