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
Eight-ball the opponent of the fouling player wins. Most commonly of all in American – sometimes called straight eight by its aficionados, and usually played on coin-operated, smaller tables – a requirement may be that all shots be . This typically includes what balls and bank/kick cushions will be involved in the shot, and in what order. The shot considered a turn-ending (but not ball-in-hand) foul if not executed precisely as planned, but a loss of game if the "foul" shot pocketed the 8 ball. Contrariwise, some Americans hold that nothing other than the 8 ball has to be called in