Bests & Worsts Reviews from Amazon

I have purchased a few exercise balls in the last 20 years. Names keep changing, but essentially they are the same thing. I currently have a 75 and 65 cm ball and now the 75 cm by Mantra called the "Bodyball." What makes this unique, and practical, is it comes with a ring that the ball fits in and makes it easy to use as a chair. I am an author and spend a lot of time at my desk. The ball/chair is easy to sit on and balance and I feel results on my core. In addition, there are two exercise straps and a great chart of exercises to perform on a daily or weekly basis. I'm not using barbells or dumbbells, but I do feel great. Oh, and I am 72 years old.