Masutatsu Oyama was born in Korea in 1923 and is the founder of Japan's most famous and widespread karate style in the world. At the age of 9, Mas Oyama learned Chinese kenpo in Manchuria and practiced judo and boxing as a teenager. All this leads to training in Okinawan karate, which serves as a basis for creating his own style, Kyokushin or "Absolute Truth". When he turned 20, Mas Oyama received a 4th dan in Okinawan karate and with the help of tireless work he also received a 4th dan in judo. 

Among Mas Oyama's many achievements, he is best known for introducing tameshiwari, or "breaking stones," into modern karate. Mas Oyama achieves this with intense training by making his arms as strong as hammers. By his logic, after a person can break stones with a hammer, he begins to learn and train to break boards, bricks and stones with his bare hands. He transformed this incredible power into his theory of karate, taking into account that if he could break stones, he could break human bones as well. His greatest contribution to Japanese karate is considered to be the introduction and popularization of full-contact karate. When he wins the biggest Okinawan-sponsored Shotokan karate tournament, he is often punished for fighting too hard, injuring his opponents. His experience, among other influences, led to the creation of Kyokushin Karate. Above all, Mas Oyama believes that karate is the art of fighting: Unless one goes to extremes involving breaking one's opponent's bones (applied in real life and fighting life and death), one will never understand one's true spiritual potential. of karate.