McMaster University published a resource on physical activity for preschoolers. A recent study indicated that preschool children should take at least 6000 steps every day participating in at least 180 minutes of physical activity per day of any intensity. By age 5, children should participate in 60 minutes of energetic play (ie biking, running, playing tag, etc.).
This information is helpful for goal setting for young children at risk for motor delays, decreased endurance and/or obesity.
Reference: McMaster University. Step Counts and Physical Activity. Retrieved from the web on 5/31/13 at http://canchild.ca/en/childrenfamilies/resources/chemp_newsletter_issue_10.pdf.