yoga ball,gym ball,blance ball: material:PVC or eco-friendly ATBC ISO9001 & CE certified ... known by various names, including Swiss ball, balance ball, birth ball, body ball, fitness ball, gym ball, Pilate ball, stability ball and therapy ball. It can also be used in ... , membership in doing yoga ball exercise should be ready to water and towels, at any time to add moisture. fitness gym ball/yoga ball