Exercise ball Exercise ball An exercise ball, also known as a Swiss Ball, is a ball constructed of soft elastic with a diameter of approximately 35 to 85 centimeters (14 to 34 inches) and filled with air. The air pressure is changed by removing a valve stem and either filling with air or letting the ball deflate. It is most often used in physical therapy, athletic training and exercise. It can also be used for weight training. The ball, while often referred to as a Swiss ball, is also known by a number of different names, including balance ball, birth ball, body
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