Probably the martial art most closely associated with Japan, judo is a self-defence technique that developed out of the Edo-era fighting schools of Jujutsu. All judo activities in Japan are controlled by the All-Japan Judo Federation , at the Kodokan Dojo, 1-16-30 Kasuga, Bunkyo-ku (tel 03/3818-4199), reached from either Kasuga or Korakuen subway stations in Tokyo. The dojo has a spectators' gallery open to visitors free of charge (Mon-Fri 6-7.30pm and Sat 4-5.30pm). There's also a hostel here where you can stay if you have an introduction from an authorized judo body or an approved Japanese sponsor. Judo is also taught at the Nippon Budokan Budo Gakuen, 2-3 Kitanomaru-koen, Chiyoda-ku (tel 03/3216-5143), near Kudanshita subway station in Tokyo.