This is a quote from an article on CBS News:
"One of the largest studies of its kind shows just how sluggish American children become once they hit the teen years: While 90 percent of 9-year-olds get a couple of hours of exercise most days, fewer than 3 percent of 15-year-olds do."
[Editor's Note: The link is still active as of 10/24/2013]
Thought you'd be interested to see it. Sure hits home with the posts you've been getting lately.