Mário "Sapo" Reis is a notable figure in the world of Brazilian jiu-jitsu. He is recognized for his contributions as a practitioner and instructor, helping to popularize the sport in Portugal. His nickname, "Sapo," translates to "Frog" in English, reflecting his agility and skill on the mat. Reis has trained numerous students and has been involved in various competitions throughout his career. He is also known for his affiliation with the Gracie family, a prominent name in jiu-jitsu history. His dedication to the sport has made him a respected mentor in the martial arts community.