Sensei Kuramoto's Punch

Sensei Kuramoto Nariharu is one of the top students of Sensei Nakamura Hideo. He's a literal human weapon, with thoroughly conditioned hands, feet, etc, even his head. He has broken clay sewer pipes with his headbutt. His karate is not about fancy techniques, but a solid foundation on the kihon, basics. I really like the sand makiwara he is using in this video. Very solid, but offers enough resilience to use safely. I couldn't understand most of what he was teaching in this video, but he seems to be stressing the importance of hitting with the strong portion of the fist.