Sun Lutang (1860-1933) was a master of Chinese neijia (internal) martial arts and was the progenitor of the syncretic art of Sun-style tai chi. He was also considered an accomplished Neo-Confucian and Taoist scholar, and was a distinguished contributor to the theory of internal martial arts through his many published works.

Tai chi is an internal Chinese martial art practiced for self-defense and health. Known for its slow, intentional movements, tai chi has practitioners worldwide and is particularly popular as a form of gentle exercise and moving meditation, with benefits to mental and physical health.