Exercise ball standard exercises, such as a push-up, on an unstable surface can be used to increase activation of core trunk stabilizers and in turn provide increased trunk strength and greater resistance to injury. Fitness Experts and some doctors also recommend sitting on an exercise ball instead of an office chair. That is based on the theory that the abdominal and back muscles are constantly engaged and active to maintain proper posture and balance on the ball. There is no scientific evidence of those benefits occurring by just sitting without additional exercises. However, some people warn against using a Swiss ball as
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