Tai Chi, also known as Shadow Boxing, is one of the major branches of the traditional Chinese martial arts. Its name is derived from the philosophical term, “Tai Chi,” the first known written reference of which appeared in the Book of Changes over 3000 years ago during the Zhou Dynasty (1100-1221 BC). In this book it says that “in all changes exists Tai Chi, which causes the two opposites in everything.” Tai Chi means the ultimate of ultimate, often used to describe the vastness of the universe.