A gymball has to offer a fine balance between support and instability, if the ball is too rigid or too soft then the effects on your core stabilising muscle will be compromised. The Reebok gymballs all perform to these optimal levels even if you are simply using the ball to sit on at a desk or performing dynamic exercises.
The Reebok Gym Ball Ø 65cm has the following features:The Reebok Gym ball Ø 65cmis especially designed to prevent tear and wear. The gym ball comes with an air pump and an inspirational workout DVD by Reebok with a range of exercises you can do at home. Specifications: Reebok gym ball Ø 65cm Designed for people with a body height of 168-178cm Maximum weight: 110kg Including air pump and Work-Out DVD