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
500 (ball game) must wait until the ball touches the ground before they pick it up in order to receive the 100 points at stake. If a catcher's score goes over 500, that person will revert to 0 and will become the thrower, and the thrower will in turn become a catcher. The game can be played using a frisbee instead of the ball. Kick Ball 300 is a variation where the ball is kicked as well as being thrown and caught. It was designed as a training exercise to promote cooperation in competitive games. 500 (ball game) 500 is a ball game