Tai Chi is an internal Chinese martial art that is practiced both for its defense training and for its health benefits. The term tai chi refers to a philosophy of the forces of yin and yang related to the movements. Although originally intended as a martial art, it is also usually practiced for a variety of other personal reasons: competing wrestling format, demonstration competitions, and achieving a longer life. As a result, there is a multitude of training forms, both traditional and modern, that match those goals with different emphasis. Some forms of training or táijíquán are mainly known because they are practiced with relatively slow movements.