Offering a fine balance between support and instability, this adidas gym ball is perfect for strengthening your core muscles. Designed with anti-burst material for added safety, it features a dual texture grip for extra stability. The 65cm diameter is ideal for users between 5'7 and 6'1 in height - this is important to know when selecting your gymball as your knees should be positioned just a little lower than your pelvis to make a 90 degree angle.
