Iron fist belongs to the internal strength of Shaolin Waijiaquan, which is specially used to train bridge players. Tiexianquan is a set of health-preserving boxing, which mainly exercises limbs, dredges blood vessels, and has the functions of strengthening the body and turning weakness into strength! Tieqiao III, the leader of the "Ten Tigers in Guangdong", was good at this stunt and was later taught to Huang Feihong by Tieqiao III disciple Lin Fucheng.