http://www.bjjhacks.com/scramble — Julio Cesar (6th degree black belt, 50 years old and head coach of GFTeam) rolls with his student Gutemberg Pereira (20 years old, purple belt, IBJJF 2014 world no-gi champion, 2015 PanAm champion).
BJJ Hacks: 50yo Jiu-Jitsu Black Belt Trains with 20yo World Champion
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