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
Ball (rhythmic gymnastics) ball is sometimes placed on their back while the gymnast does a skill such as a walk-over. Ball (rhythmic gymnastics) The ball is an apparatus used in rhythmic gymnastics. It is made of either rubber or synthetic material (pliable plastic) provided it possesses the same elasticity as rubber. It is in diameter and must have a minimum weight of . The ball can be of any colour. The ball should rest in the gymnast's hand and not rest against the wrist or be able to be grasped. Fundamental elements of a ball routine include throwing, bouncing or rolling. The gymnast