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.
This chair makes me to maintain good posture and use inner muscle. It is more comfortable than just sit on the balance ball (and you can sit down on it much longer).
I write a lot of reports and sit A LOT. I wanted to make the time I spend seated more "active". This does the trick. Very easy to put together (minutes, because we used an air compressor that we had) and I have been using it ever since. I still have to think about my posture (I have learned to slump on this thing when I am distracted!). I have attempted the few exercises that came with the chair--nothing earth shattering but it does remind you to re-engage your core. The size was perfect for my home office. I have a nice set of shelves and desk and I was afraid that a round, rubber chair would look tacky but all you see when you come into the room is the tip of the black frame--perfect!
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