From the moment she could hoist herself up, my daughter Layla has loved to climb. She's as happy hanging from the monkey bars as she is swinging on a doorknob. Her twin brother, Nolan, is far more contemplative. He takes the time to line up a ball before he kicks it and carefully studies the fastest way to get down a playground slide. But they share one key thing in common: They both love to move.

I'm not trying to raise an Olympic gymnast or a future major leaguer. But in light of our nation's scary childhood-obesity
crisis -- the rate more than doubled among children ages 2 to 5 and tripled for 6- to 11-year-olds since 1980 -- I want to instill in my kids a lasting love of physical activity.

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