Early life
Chiba’s Olympic gymnastics aspirations ended with a chronic back injury at Nippon Sport Science University. He shifted to karate under Mas Oyama, earning a black belt. In 1960, Toei Studios discovered him in a talent search, landing his screen debut. He was born Sadao Maeda in Fukuoka on January 23, 1939, the son of a military test pilot. Those formative experiences—theater, gymnastics, karate—shaped his career in martial arts cinema.