Instruct: Classify Amazon reviews into positive or negative sentiment
Query: exercise ball

For the price, I guess it was worth it. I did not like the material or feel of the ball. It did blow up just fine and is definitely for short people. I am 5'5" and I should have got the 65 CM ball. If you don't want to pay more for your 1st ball, I would recommend this. Other than that I would pay more for a better material. The material was thick and no problems with it bursting or holding the weight.