Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: I LOVE THIS BALL!

This ball is much sturdier and more stable than other balls I have tried. I sit on my SPRI 65cm ball ALL the time when watching TV as well as to exercise. It has helped stabilize my core muscles and my leg muscles. I am 67 years old and am stronger and in better physical condition than any time in my life since my basketball years. I started using this ball in 2006 after both total hip replacements. Give one a try. It could change your life - it did mine. (NOTE: I am 5'5" and 120 pounds and I prefer the 65cm ball even though SPRI recommends the 55cm ball for my size.)