Exercise ball ball, ball, fitness ball, gym ball, gymnastic ball, physio ball, pilates ball, naval mine, Pezzi ball, stability ball, Swedish ball, therapy ball, or yoga ball. The physical object known as a "Swiss Ball" was developed in 1963 by Aquilino Cosani, an Italian plastics manufacturer. He perfected a process for moulding large puncture-resistant plastic balls. Those balls, then known as "Pezzi balls", were first used in treatment programs for newborns and infants by Mary Quinton, a British physiotherapist working in Switzerland. Later, Dr. Susanne Klein-Vogelbach, the director at the Physical Therapy School in Basel, Switzerland, integrated the use of ball exercise
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