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
Harvey Ball he started his own business, Harvey Ball Advertising, in 1959. He designed the smiley in 1963. The State Mutual Life Assurance Company of Worcester, Massachusetts (now known as Hanover Insurance) had purchased Guarantee Mutual Company of Ohio. The merger resulted in low employee morale. In an attempt to solve this, Ball was employed in 1963 as a freelance artist, to come up with an image to increase morale. What he created was a smiley face, with one eye bigger than the other. In less than ten minutes, Harvey Ball came up with the simple yet world-changing smiley face. The simplicity