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
Ball (dance party) Ball (dance party) A ball is a formal dance party. Social dance forms a large part of the evening; actual ballroom dancing may or may not occur. The word "ball" derives from the Latin word "ballare", meaning "to dance"; the Latin word also developed into French "baller"—from where it swapped into languages like English or German—, and "bailar", the Spanish and Portuguese verbs for "to dance" (although all three Romance languages also know "danser", "danzar" and "dançar" respectively). Catalan uses the same word, "ball", for the dance event. A well-documented ball occurred at Kingston Lacy, Dorset, England, on 19 December