A jock is a person who is successful in athletic activities. This is a very popular word in the U.S. when talking about athletes, particularly athletes who excel in a wide variety of sports.
Leonard is kind of a jock.
Note: The word "jock" is commonly applied to members of a type of clique in middle schools and high schools in the United States. A clique is a loosely organized group of kids who identify themselves according to skills, abilities, attitudes, and background. Other names for cliques in school include, brains (smart kids), freaks (drug users), geeks (socially awkward kids), hipsters (kids who try hard to be cool), rockers (kids who like rock music), nerds (smart kids or kids proficient with technology) and emos (kids who wear dark clothing, get tattoos or piercings, and experiment with alternative lifestyles). Names given to cliques also vary depending on region and levels of economic differences within communities.
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