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"The fitness ball has been a progressive alternative to desk-space seating and these muscle-strengthening chairs are the latest example. The Fitness ball promotes flexibility, motor skill and balance.  Your body needs to work to balance on top of an exercise ball, and by doing so, you&amp;rsquo;re strengthening your core as well as smaller surrounding muscles.   If you&amp;rsquo;ve ever tried one of these balls, then you know it takes a hard time to get used to and to feel more like a gimmick than an actual workout.  The Fitness Ball Chair helps you to gradually work your way up to balancing yourself with or without the backrest. This chair is suitable for many people at the office or at home who want to develop strength in their muscles but haven&amp;rsquo;t got much time.  The Fitness Ball Chair will also help to relieve some of your lower back pains while encouraging active sitting."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.trendhunter.com/trends/musclestrenghtening-chairs>