Tai chi chuan (traditional Chinese: 太極拳; simplified Chinese: 太极拳; Hanyu Pinyin: tàijíquán; Wade-Giles: t'ai4 chi2 ch'üan2) is an internal Chinese martial art often practiced with the aim of promoting health and longevity. Tai chi chuan's training forms are well known as the slow motion routines that groups of people practice together every morning in parks around the world, particularly in China. Medical studies support its effectiveness as an alternative exercise and a form of martial arts therapy.citation needed] Tai chi chuan 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. There are many different styles of tai chi chuan, but most modern schools can trace their development to the system originally taught by the Chen family to the Yang family starting in 1820.