There *is* resistance. Depending on the typing of bouncing and where you hold on, you get both upper body and lower body involvement.
I can't find the link for the studies that show bone density improvement, but that was the use my endocrinologist was most familiar with for the chair.
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Date: 2009-07-02 06:50 pm (UTC)I can't find the link for the studies that show bone density improvement, but that was the use my endocrinologist was most familiar with for the chair.