Ziranmen (simplified Chinese: 自然门; traditional Chinese: 自然門; pinyin: zìránmén; Wade–Giles: tzu-jan men; literally "the ziran ["natural"] style"), also known as Natural Boxing, is a Northerninternal style of kung fu[1] that is taught in conjunction with qigong breathing techniques. The style traces its lineage to Dwarf Xu, who based it on ancient Taoist philosophy.[2]Du Xinwu, the next bearer of the lineage, served as a bodyguard to Sun Yat-sen, then the provisional president of the Republic of China. Du imparted his knowledge of "Natural Boxing" to his eldest son Du Xiusi and Wan Laisheng, a prominent twentieth century martial artist.