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
Three-ball 2 and 3 balls) are racked either in a triangle — usually aluminum, wooden or plastic, like a miniature eight-ball or snooker rack — with the apex ball on the , or in a straight line, again with the lead ball on the foot spot, and the other balls behind it, lined up toward the center of the . No particular arrangement is necessary, as there is no specific order in which the balls must be pocketed, nor do any of them have specific point values. Racking is often simply done by hand, though there have been at least two