By creating instability, more supporting muscles are recruited, primarily the abdominals core and lower back. Balance and coordination are also improved, making the ball a useful tool in a wide range of strength and conditioning programs.
Made from puncture resistant PVC rubber, this ball won't burst and suddenly deflate, making it much safer for the user. This ball is our smallest 55cm size. purple in colour. We recommend sizing the ball that's right for you by sitting on a swiss ball and checking to see if your knees are at right angles. As a general rule 55cm balls suit people around 150-165cm in height.