I was looking for an exercise ball large enough to use as a chair at my desk for strenghting of my core. I had a smaller ball but it wasnt tall enough when i sat at my desk. This ball is 3 feet tall and i didnt fill it all the way so it is softer to sit on. It is perfect for what i was looking for.
I am very petite, so this chairs fits me well, but I'm certain it would not work for someone over 5'10" or so. I use it for my art work and it helps me balance and keep my back from straining. Love it.
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