T'ai chi ch'uan or tàijíquán, often shortened to t'ai chi, taiji or tai chi in English usage, is an internal Chinese martial art practised for both its
defense training and its health benefits. It is also typically practised for a variety of other personal reasons: its hard and soft martial art technique, demonstration competitions,
and longevity. As a result, a multitude of training forms exist, both traditional and modern, which correspond to those aims. Some of t'ai chi ch'uan's training forms are especially
known for being practised with what most people would categorise as slow movement.