I think hooves is right that parents are very wary nowadays of letting their kids go outside unsupervised, so the kids stay home. And don't exercise.
It seems to me, too, though, that there aren't as many open areas for kids to play now, either. Everything gets developed and turned into someone else's private property with no trespassing signs. My parents' development won't even allow clotheslines in the back yard- I can't imagine what they'd do about kids drawing hopscotch boards on the sidewalks out front.
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