Your legs should be bent at 90 degrees. This ball is so small it won't let it. I'm 1.50 m tall and that's too small for me. It stinks too. This may be due to the type of eco-friendly plastic they use, which is thoughtful, BUT it smells bad so be prepared. The socks are good and the booklet is ok. In most of the photos, the woman's knees are at a 45-degree angle, which I don't think is the right position. I will return this item.
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