1) Chinese invention 
Not to be confused with Ben Wa balls. Baoding balls ({zh|s=保定健身球|t=保定健身球|p=Bǎodìng Jiànshēn Qiú}, literally `Baoding physical exercise balls`) are also known as Chinese exercise balls, Chinese meditation balls, Chinese medicine balls, and healthy balls. They are a traditional product of Baoding, China, thought to have be.....