Strong Fist is the signature fighting style of Might Guy and Rock Lee. Its goal is to inflict external damage and break bones, making it the complete opposite of the Hyuga clan's Gentle Fist. The style is built on crushing blows and requires great physical strength and endurance from the fighter. A novice with insufficient training will quickly tire out and overload the body, as happened to Sasuke Uchiha on his first attempt to use this style. Only after a month of training was Sasuke able to use it freely. Sasuke himself and Kakashi Hatake do not practice this style constantly, but adopted its key elements and individual techniques, copying them with the Sharingan from Rock Lee and Might Guy.
