在武术界,由宋氏形意拳开派宗师宋世荣先生首传于世的武学秘典——《内功四经》共四部,由《内功经》、《纳卦经》、《神运经》、《地龙经》共同组成。在宋世荣先生《内功四经》手抄本之最后云有“此书自初得者言,清初总宪王公得之于水底石函中,上卷名《剑丹》,下卷名《内功》。百年之后,南溪子悟透玄机,方知是宝传,付与知己宗景房”等语。宋世荣先生得于燕都刘晓棠,刘晓棠得于沈阳工部库中。据说《剑丹》已亡佚,仅遗《内功》传世。有关《内功四经》的来源与历史,目前我们也就仅知 In the martial arts world, Song Xingyi, the founder of the Song Xingyi Fist, first handed down the world’s martial arts secret book - “Four Internal Merits,” a total of four, from the “internal power”, “Na Gua Jing”, “ ”,“ Dragon ”together. In the last book of Song Shirong’s “inner strength four classics” manuscript cloud “ This book from the early winners say, the general constitution of the early Qing Dynasty at the bottom of the stone, the scroll name” sword Dan “, the volume name” internal strength A hundred years later, Nan Xi Zi Wu Xuan mystery machine, side knowledge is treasure pass, pay and confidante King Room “and other terms. Mr. Song Shirong was born in Yan Du Liu Xiaoteng, Liu Xiaotang won the library in Shenyang. It is said that ”Dan Dan“ has been lost, only ”internal strength“ handed down. As for the source and history of the ”Four Categories of Internal Strength," we now know it only