structural:summarization, information:classification
Usage in martial arts

Katana were used by samurai both in the battlefield and for practicing several martial arts, and modern martial artists still use a variety of katana. Martial arts in which training with katana is used include aikidō, iaijutsu, battōjutsu, iaidō, kenjutsu, kendō, ninjutsu, Tenshin Shōden Katori Shintō-ryū and Shinkendo. However, for safety reasons, katana used for martial arts are usually blunt edged iaito or wooden bokken, to reduce the risk of injury. Sharp katana are only really used during tameshigiri (blade testing), where a practitioner practices cutting a bamboo or tatami straw post.