A martial arts expert is someone who has achieved a high level of proficiency in one or more martial arts disciplines. A Judoka is a martial artist who specializes in the Japanese martial art of judo, which focuses on throws, holds, and joint locks. A NINJA is a martial artist who specializes in the Japanese martial art of ninjutsu, which focuses on stealth, agility, and deception. A NINA is a martial artist who specializes in the Chinese martial art of wushu, which focuses on unarmed combat and weapons training.