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Sitting on the Health Mark Body Tone Swiss Ball Chair, your body is constantly making small adjustments with the postural muscles, abdominals, and leg muscles. It is "active sitting" rather than the slumping and poor posture we develop even in ergonomic desk chairs.
The inflatable ball is held tightly in place, or it can be removed for advanced balance training. Casters have locking mechanism so chair can be stationary as well as mobile.