形意拳
A variety of Important texts have survived throughout the years, often called "Classics", "Songs" or "Theories". These texts use intentionally vague language to describe the principles and methods of practice in LiuHe XinYi Quan, Dai XinYi Quan and Xing Yi Quan. They are less relevant to more modern interpretations of these arts, such as Yi Quan. In the past, these text were copied by hand, and were kept secret.