極真流 (Kyokushin) is a style of martial arts founded by 大山倍達 (Masutatsu Oyama) in the mid-20th century. It emphasizes full-contact sparring and practical techniques, focusing on physical conditioning and mental discipline. Practitioners train rigorously to develop strength, speed, and resilience. The philosophy of 極真流 promotes self-improvement and respect for others. It incorporates traditional 空手 (karate) principles while encouraging students to push their limits. Competitions often feature knockout rounds, showcasing the effectiveness of techniques in real combat situations.