BLUE BELT PURPLE BELT BROWN BELT BLACK BELT Athlete/Instructor Ranks: 1st to 3rd Gray (rank) – at least 3–5 years of practice for each rank.(The minimum age for 1st-degree black belt is 23.) *Athletes can only advance up to 3rd-degree black belt. Starting with 4th-degree, one must also serve as an instructor or assistant coach. Instructor ranks: 4th and 5th degree … Continue readingabout belt structure and colors