The art received its name when a scholar in the Imperial Court, Ong Tong He, witnessed Yang Lu Chan ("Unbeatable Yang") demonstrate. Ong wrote: 'Hands Holding Tai-Chi shakes the whole world, a chest containing ultimate skill defeats a gathering of heroes.'
Tai-Chi Chuan is generally classified as a form of traditional Chinese martial arts of the Neijia (soft or internal) branch. It is considered a soft style martial art — an art applied with internal power — to distinguish its theory and application from that of the hard martial art styles.
Since the first widespread promotion of Tai-Chi's health benefits by Yang Shaohou, Yang Chengfu, Wu Chien-Ch'uan and Sun Lutang in the early twentieth century, it has developed a worldwide following among people with little or no interest in martial training, for its benefit to health and health maintenance. Medical studies of tai chi support its effectiveness as an alternative exercise and a form of martial arts therapy.
Focusing the mind solely on the movements of the form purportedly helps to bring about a state of mental calm and clarity. Besides general health benefits and stress management attributed to Tai-Chi training, aspects of traditional Chinese medicine are taught to advanced Tai-Chi students in some traditional schools. Some martial arts, especially the Japanese martial arts, use a uniform for students during practice. Tai-Chi Chuan schools do not generally require a uniform, but both traditional and modern teachers often advocate loose, comfortable clothing and flat-soled shoes.
The physical techniques of Tai-Chi Chuan are described in the tai chi classics (a set of writings by traditional masters) as being characterized by the use of leverage through the joints based on coordination in relaxation, rather than muscular tension, in order to neutralize or initiate attack. The slow, repetitive work involved in the process of learning how that leverage is generated gently and measurably increases, opens the internal circulation (breath, body heat, blood, lymph, peristalsis, etc.)
The study of Tai-Chi Chuan primarily involves three aspects:
Health: An unhealthy or otherwise uncomfortable person may find it difficult to meditate to a state of calmness or to use tai chi as a martial art. Tai-Chi's health training therefore concentrates on relieving the physical effects of stress on the body and mind. For those focused on Tai-Chi's martial application, good physical fitness is an important step towards effective self-defense.
Meditation: The focus and calmness cultivated by the meditative aspect of tai chi is seen as necessary in maintaining optimum health (in the sense of relieving stress and maintaining homeostasis) and in application of the form as a soft style martial art.
Martial art: The ability to use Tai-Chi as a form of self-defense in combat is the test of a student's understanding of the art. Tai-Chi Chuan martially is the study of appropriate change in response to outside forces; the study of yielding and "sticking" to an incoming attack rather than attempting to meet it with opposing force.