Sport in which two competitors grapple with and strive to trip or throw each other down or off-balance. It is practiced in various styles, including freestyle wrestling, in which contestants can use holds above and below the waist, and Greco-Roman wrestling, which allows only holds above the waist. Sambo is a style of Russian origin employing judo techniques. Sumo wrestling is a specialized Japanese variety. U.S. professional wrestling is today among the most popular of all spectator sports, though it principally involves wildly flamboyant showmanship, including such nonclassical moves as kicks to the head that would be lethal if they were not actually pulled.