Which is best - Office Chair or Exercise Ball when sitting at the workplace?
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ProBody Pilates Ball Yoga Ball Chair, Exercise Ball Chair with Base or Stand for Home Office Desk Sitting or Workout, 65cm Antiburst Balance Ball & Stability Ball Seat for Back, abs (Black) :
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Gaiam Ultimate Swivel Balance Ball Chair | Canadian Tire
What Are the Pros and Cons of Having an Exercise Ball for an Office Chair?