Question: What former leader of the Gracie Humaitá school in Rio de Janeiro, Brazil, with the help of his father, demonstrated the Ashi-Hishigi in several medias?
Sentence (from "Royler Gracie"): Royler Gracie (born December 6, 1965) is a retired Brazilian-American mixed martial artist and Brazilian jiu-jitsu practitioner.
Relevant evidence: Yes