During their third year, children are in constant motion–running, kicking, climbing, and jumping. They accomplish several major motor milestones during this period, and as their coordination grows, they start running smoothly and easily. Although it isn’t necessary for parents and caregivers to suggest specific activities that promote the development of motor skills, giving preschoolers plenty of time for running, playing, and exploring outside aids the process.
Shelov, S. P. (Editor-in-Chief). (2004.) Caring for Your Baby and Young Child: Birth to Age 5. The American Association of Pediatrics. Revised edition. New York: Bantam Books.