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
The Billiard Ball The Billiard Ball "The Billiard Ball" is a science fiction short story by American author Isaac Asimov, written in September 1966 and first published in the March 1967 issue of "If". It appeared in Asimov's 1968 collection "Asimov's Mysteries", in his 1973 collection "The Best of Isaac Asimov", in his 1986 collection "Robot Dreams" and in "The Complete Stories, Vol. 2". An example of what Asimov called his "late style", the story is a journalist's recollection of the events surrounding the discovery of an anti-gravity device in the mid-21st century. Heavy with physics theory, the story describes the relationship between