Known as Kyokushin or kyokushinkai or kyokushinkaikan. Kyokushin kaikan is a style of stand-up, full contact karate, founded in 1964 by Korean-Japanese karate master, Sosai Masutatsu Oyama. Kyokushinkai is Japanese for "the society of the ultimate truth." Kyokushin is rooted in a philosophy of self-improvement, discipline and hard training. Its full contact style has had international appeal (practitioners have over the last 40+ years numbered more than 12 million).
In kyokushin tournaments fighters are permitted to kick anywhere, including the head of their opponents, and fighters do not wear any padding or gloves but are only allowed to punch to the body
Kyokushin training consists of three main elements: technique, forms, and sparring. These are sometimes referred to as the three "K's" after the Japanese words for them: kihon (basics), kata (forms), and kumite (sparring).
Kata is a form of ritualized self-training in which patterned or memorized movements are done in order to practice a form of combat maneuvering. According to a highly regarded Kyokushin text, "The Budo Karate of Mas Oyama" by Cameron Quinn, long time interpreter to Oyama, the kata of Kyokushin are classified into Northern and Southern Katas. For a further classification we need to look closer at each kata and their creator.
Sparring, also called kumite, is used to train the application of the various techniques within a fighting situation. Sparring is usually an important part of training in most Kyokushin organizations, especially at the upper levels with experienced students.
In most Kyokushin organizations, hand and elbow strikes to the head or neck are prohibited. However, kicks to the head, knee strikes, punches to the upper body, and kicks to the inner and outer leg are permitted. In some Kyokushin organizations, especially outside of a tournament environment, gloves and shin protectors are worn. Children often wear headgear to lessen the impact of any kicks to the head. Speed and control are instrumental in sparring and in a training environment it is not the intention of either practitioner to injure his opponent as much as it is to successfully execute the proper strike. Tournament fighting under knockdown karate rules is significantly different as the objective is to down an opponent. Full-contact sparring in Kyokushin is considered the ultimate test of strength, endurance, and spirit
Also known as Goshin-jutsu, the specific self-defense techniques of the style draw much of their techniques and tactics from Mas Oyama's study of Daitō-ryū Aiki-jūjutsu under Yoshida Kotaro. These techniques were never built into the formal grading system, and as kyokushin grew increasingly sport oriented, the self-defense training started to fall into obscurity. Today it is only practiced in a limited number of dojos.
Many high level strikers in UFC (MMA), muay thai, and K1 tournaments have a background in kyokushin