Title: Doesn't hold shape
Review: Because the surface of the ball is very smooth, it picks up any dust or dirt particles that might be on the floor. I wanted to use this ball as a chair, but the material is so stretchy that when I sit on it, the ball collapses to about half of its fully expanded height. I weigh 165 lbs. It also just doesn't hold its shape when I do crunches on it. Not recommended.
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