Exercise ball a chair because of ergonomic considerations or biomechanical reasons. This large plastic ball, known as a "birth ball", can also be used during labour to aid the descent of the fetal head into the pelvis. Sitting in an upright position will also aid fetal positioning and is more comfortable for the woman. Sitting on the ball with arms placed on a bed, table or otherwise sturdy object for support and gently rocking the hips may help the woman during contractions and aid the natural physiological process of birth. Exercise ball An exercise ball, also known as a Swiss Ball, is
Bandy ball Bandy ball A bandy ball is a rubber ball used for playing bandy. The core of the ball is made of cork and this is surrounded by rubber or rubber-like plastic. The ball should be manufactured in a diameter of 62.4 mm or 63.8 mm (the latter is called "Russian ball") and the colour was originally red, later orange or cerise. According to the Bandy Playing Rules set up by the Federation of International Bandy, any of these is allowed, but all balls used in one game must be of the same colour and type. Bandy balls are manufactured by