champion sports ball base champion sports the champion sports exercise ball base is a versatile tool that provides extra stability to your exercise ball workout. suited for balls 65 cm and up, this base is a great tool for those new to using an exercise ball. you can also use the base to store a single ball and stop worrying about it rolling away. it also provides a great way to transform your exercise ball into an office chair. this will help you build core strength and better posture while seated in front of a computer. so, outfit your exercise ball and have a tool for success with the champion sports exercise ball base.