Martial arts are codified systems and traditions of combat practices, which are practiced for a number of reasons: as self-defense, military and law enforcement applications, mental and spiritual development; as well as entertainment and the preservation of a nation's intangible cultural heritage. Improved concentration, reflexes, muscle tone, flexibility, balance and strength as well as psychological benefits can be gained through regular practice of martial arts. Other martial arts schools, classes or events that are not listed under the main categories are listed here.