[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.

[4] Ziranmen make use of four fundamental techniques: Tun (contraction), Tu (expansion), Fu (floating) and Chen (sinking).

Ziranmen is also noted for its footwork (bu fa), which involves moving lightly on the balls of the feet and enables sudden changes of direction.

[4] The basic training routine is a static exercise which involves rotating the hands in sequence; Du Xinwu is said to have practiced this routine atop wooden stakes with weighted sandbags attached to his arms and legs, which enabled him to highly develop his qing gong ("light body technique").

[3] Practitioners also make use of pai da gong techniques, which involves striking and being struck by various pieces of equipment, including wooden posts, sandbags and iron balls.