I injured my leg and could not exercise for an extended time. This machine really helped my circulation and balance. It's heavy and not easy to move around. Once I was ready to advance, I gave it to my neighbor with a mobility issue and they saw marked improvement, as well.
I love this chair! It helps with my slouching and my leg-crossing, both of which I am always working to stop. The only downsides to this chair is that I have to re-inflate it every few months, and the breaks on the wheels are easily tapped, which is irritating, and one of them has already broken off (likely the fault of a student, but anyway). The final thing that I found problematic was that this particular chair was too short for my desk, and I had to purchase chair leg extenders from http://www.gaiam.com/product/classic-balance-ball-chair-leg-extenders/95-1561.html
Got this item for my daughter. She uses it for ankle strength, core work and balance. We keep it in the living room and she'll hop on while waiting for me, watching tv or just for a couple of minutes here and there. The price was fair, quality great. Just what we were looking for.
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