Grand Lake Martial Arts is a martial arts school in Grove, Oklahoma. Source notes highlight the Carlos Machado Brazilian Jiu Jitsu lineage, noting Machado as a pioneer of Brazilian Jiu Jitsu in the United States, a Coral Belt, and a black belt promoted by Carlos Gracie Junior. In the early 1990s, Machado and his brothers formed the RCJ Machado Jiu Jitsu Association, described in the source as one of the strongest and growing BJJ organizations in the world.