NYDA Physio Ball 65cm

Heavy duty PVC exercise ball, burst resistant to 350kg. To select the correct size you should measure your sitting position to the ground while your knees are at a 90 degree angle. Sit slightly higher if using your ball as a desk chair.Recommendations:
Height over 180cm - 75cm ball
Height 168-180cm - 65cm ball
Height 156-168cm - 55cm ball
Height under 156cm - 45cm ball