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
John Ball (priest) editorial staff. John Ball appears in the 1954 historical novel Katherine by Anya Seton. Ball made a star appearance in the Newbery Medal-winning 2002 novel "". He was a priest, as he usually is, and was assisting a character by the name of Bear in the Peasants' Revolt of 1381. John Ball is referenced several times in T. H. White's "The Once and Future King", most prominently in the fourth book, "The Candle in the Wind". In the final chapter (14), King Arthur muses on his failure to unite England. King Arthur tries to understand what forces are at work