original_query: What is Renato Sobral's background in martial arts?
query: What is Renato Sobral's background in martial arts?
answer: Renato Sobral's martial arts background includes wrestling (South American Champion in 1998, three-time Brazilian National Champion), Muay Thai (Brazilian National Champion in 1992), Luta Livre (black belt under Marco Ruas), and Brazilian Jiu-Jitsu (black belt under Carlos Gracie Jr.). He also trained in Ruas Vale Tudo.