Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Same as gym quality

The big thing with the BOSU balls is that the "ball" portion be made from a durable material. This BOSU is made of the same thick material that is found at a commercial gym. My wife and I have been using it for about 5 weeks now, 2x each per week with no issues. It has not needed to be re-filled with air in that time.