I did know that yoga practitioners too use fitness balls. When a friend asked me about it replied I do not know anything about these balls I searched the Internet and found that people do use yoga calls. A Yoga ball is used to strengthen and firm abs, back and buttock.
I forwarded him the link and told him how to place his order.
yogadirect.com sells Yoga balls of different colors and sizes. One can buy a Yoga ball according to his/her requirements. These are made of good quality durable vinyl and designed to support weight up 600 lb.