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
500 (ball game) must wait until the ball touches the ground before they pick it up in order to receive the 100 points at stake. If a catcher's score goes over 500, that person will revert to 0 and will become the thrower, and the thrower will in turn become a catcher. The game can be played using a frisbee instead of the ball. Kick Ball 300 is a variation where the ball is kicked as well as being thrown and caught. It was designed as a training exercise to promote cooperation in competitive games. 500 (ball game) 500 is a ball game