This technique was made by Yaichi. This is a fighting style technique, while in sage mode, Yaichi gathers his chakra in his arms, legs, and head. Chakra gathered in those parts of his body makes his speed and strength in those areas even stronger than it already . The strength of a punch or kick can break through rock and metal, and is so fast that the Sharingan in its third tomoe has trouble keeping up with it. The downfall is that since most of the chakra is gathered in those areas, the body is most vulnerable.