This is the pa gua of Taoism. The trigrams surrounding the yin yang symbolize the essential elements which comprise the universe, while the yin yang symbolizes the balance of its energies. I want this as a tattoo on my wrist...obviously not with the translations!
Understanding QiGong and Qi: This is a narrative explanation of controlling Qi in the body. It uses clips from a variety of videos produced by YMAA. Dr. Yang, Jwing-Ming always produces fine training videos. This one is not necessarily a How-To but an explanation of the outcome goal of qigong practice.