Du Xinwu (Chinese: 杜心武; Wade–Giles: Tu Hsin-wu; 1869–1953), aka Ru Xia (儒侠), Dou Mi Guan Jushi (斗米观居士) was a Chinese martial artist and an important figure in the development of Zi Ran Men kung fu.
Here, in an attempt to find a new teacher, he issued a general challenge by posting a notice on a street corner.
Xu soundly defeated Du and then took him on as a student, teaching him the Zi Ran Men style.
In 1900, he travelled to Japan to study at Tokyo Agricultural University, where he met and befriended the revolutionary leader Song Jiaoren.
Now fully engaged with the revolutionary movement, Du used his contacts in China's Tiandihui underworld to help Sun establish the Tongmenghui Party.