- Blue belt is the second adult rank in Brazilian jiu-jitsu. At the blue belt level, students gain a wide breadth of technical knowledge and undertake hundreds of hours of mat-time to learn how to implement these moves efficiently. Blue belt is often the rank at which the student learns a large number of techniques. The IBJJF requires that a practitioner be at least 16 years old to receive a blue belt, thereby officially entering into the adult belt system.
