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
Trac Ball traditional Trac Ball. </div> Trac Ball "Not to be confused with the computer-input device called a trackball." Trac Ball (or Trac-Ball, or Tracball) is typically a game of catch played by two or more people wherein both participants wield an oversized glove/racquet/basket, passing a ball back and forth. The racquet is similar in appearance and function to a "jai alai" basket. Trac Ball is also utilized in a game called whirlyball. Whirlyball is a game played on bumper cars where two teams using track balls attempt to score goals against one another by throwing the Trac Ball into the opposing