William Arturo Muñoz González is a Mexican luchador, known under the ring name Rush. He is currently signed to AEW. He is best known for his time performing for the Mexican professional wrestling promotion Consejo Mundial de Lucha Libre (CMLL) as well as the U.S. based Ring of Honor (ROH). Muñoz's father, Arturo Muñoz, is also a professional wrestler, most recently known under the ring name La Bestia del Ring. William's younger brothers are also professional wrestlers, using the ring names Dralístico and Dragon Lee. While most luchadors portray clear heroes or villains in the ring, Rush portrays a character that straddles that divide; his in-ring actions are often chaotic or brawling, with tendencies to cheat, but he is still popular with fans.

Lucha libre is the term for the style of professional wrestling originating in Mexico. Since its introduction to Mexico in the early 20th century, it has developed into a unique form of the genre, characterized by colorful masks, rapid sequences of holds and maneuvers, and "high-flying" maneuvers, some of which have been adopted in the United States, Japan, and elsewhere. The wearing of masks has developed special significance, and matches are sometimes contested in which the loser must permanently remove his mask, which is a wager with a high degree of weight attached. Tag team wrestling is especially prevalent in lucha libre, particularly matches with three-member teams, called trios.