[3] Miura began training in Shotokan karate at the age of 13 years, and had been promoted to the rank of 2nd dan black belt by his 18th birthday.
[4][5] Miura also studied this karate in summer vacation at the honbu dojo (headquarters training hall) of the Kyokushin in Tokyo.
[1][3][8] Soon after Miura became champion, Masutatsu Oyama (founder and director of Kyokushin karate) asked him to participate in the 100-man kumite.
[1][3] In an interview, he recalled, "Mas Oyama told some of the younger students that if they beat me they would receive instant promotion.
[9] He reached the rank of 4th dan black belt on March 18, 1973, and his physique is 1.80 m (5 ft 11 in), 75 kg (165 lb; 11.8 st).