A Tai Chi Exercise Ball?

https://www.cbs19.tv/article/news/health/ut-tyler-professors-given-patent-for-tai-chi-exercise-ball/501-258ff34e-6f7f-4a91-8894-5cd0b35befff

I'm not sure why a "Tai Chi Exercise Ball" is patent worthy as these have been around for some time now but if it gets more people to exercise then more power to them!