Duncan MMA is a veteran-owned martial arts school in Kingsport, Tennessee offering training in SGC Karate & Kickboxing, Brazilian Jiu-Jitsu, MMA, wrestling, and boxing. Its programs include Little Ninjas, kids Brazilian Jiu-Jitsu, kids karate and kickboxing, wrestling club, adult Brazilian Jiu-Jitsu, and adult karate and kickboxing for ages 14 and older.