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
Ground ball/fly ball ratio on the play receive either a GO or AO on their stat line, which is used in the calculation of the ratio. St. Louis Cardinals have led Major League Baseball in team ground ball/fly ball ratio since 2006. Sinker, cutter, and curveball pitchers tend to produce more ground balls, while pitchers who rely on fastballs, sliders, and split-fingered fastballs tend to produce more fly balls. Roughly 10% of fly balls are home runs. Fly ball pitchers in large parks however, tend to allow less than 7%. Ground ball/fly ball ratio In baseball statistics, ground ball-fly ball ratio (denoted by G/F