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<http://schema.org/description>
"The GoFit Professional Grade Core Stability Ball is a fun, yet challenging way to stretch, tone and tighten your body. What makes the GoFit Core Stability Ball so challenging? Unlike training on a stable, flat surface, the ball is a round, unstable surface, so you not only train the primary muscle groups, but also the smaller stabilizing muscles as well."
<https://www.fitnesstown.ca/GoFit/Brand.aspx?BrandID=14>