http://nccam.nih.gov/news/multimedia/video/taichiDVD
National Center for Complementary and Alternative Medicine, National Institutes of Health
Tai chi, which originated in China as a martial art, is a mind-body practice in complementary and alternative medicine (CAM). Tai chi is sometimes referred to as "moving meditation"—practitioners move their bodies slowly, gently, and with awareness, while breathing deeply.