Happy 50th Birthday, Hula Hoop. The fitness trend of 2008, this old-school child's game is now available in adult-size and two-pound weighted hoops. At Hoopnotica.com, sales have doubled to $900,000 from last year. That's because hooping is all about toning your abs and burning big-time calories. Cool kids do it virtually (see Slide 9, Wii Fit).
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