To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
My daughter ordered this for her sister for Christmas and we were all surprised when we opened it how tiny it is! I didn't realize they even made yoga balls this small, so I guess I didn't read the description. Look carefully!!
too small for the ball chair...I followed the instructions of filling, waiting 24 hours, deflate half way and refilling...I did this actually more than once...still significantly smaller than the one that originally came with the chair.