http://www.mayoclinic.com/invoke.cfm?id=FL00030
Mayo Foundation for Medical Education and Research
Children often have a natural tendency to play hard. Here's how to direct your child's energy into a lifelong love of physical activity. For many children, biking to the playground and playing kickball in the backyard have given way to watching television, playing video games and spending hours online. But it's never too late to get your kids off the couch. Use these simple tips to give your kids a lifelong appreciation for activities that strengthen their bodies.