Tai chi chuan

They are playing "Tai chi chuan" in a China park.
"Tai chi chuan" is an internal Chinese martial art practiced for both its defense training and its health benefits. It is also typically practiced for a variety of other personal reasons: its hard and soft martial art technique, demonstration competitions, and longevity. As a consequence, a multitude of training forms exist, both traditional and modern, which correspond to those aims. Some of tai chi chuan's training forms are especially known for being practiced at what most people categorize as slow movement.Today, tai chi has spread worldwide.