"Ask the Doc" investigates how many calories are being burned using an exercise ball in place of a chair.
http://cnn.com/video/data/2.0/video/health/2010/10/01/ask.the.doc.shu.exercise.balls.cnn.html
Having a ball on your desk 'chair' - CNN (video)
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http://cnn.com/video/data/2.0/video/health/2010/10/01/ask.the.doc.shu.exercise.balls.cnn.html