Yin yoga is a slow-paced style of yoga with postures that are held for longer periods of time, typically five minutes or more per posture. Its teaching in the Western world, beginning in the late 70s, was founded by martial arts expert and Taoist yoga teacher Paulie Zink.
Yin yoga poses apply moderate stress to the connective tissues of the body—the tendons, fascia, and ligaments—with the aim of increasing circulation in the joints and improving flexibility. A more meditative approach to yoga, yin aims at cultivating awareness of inner silence, and bringing to light a universal, interconnecting quality.
Yin yoga is based on the Taoist concepts of yin and yang, opposite and complementary principles in nature. Yin could be described as stable, immobile, feminine, passive, cold, and downward moving. Yang is understood to be changing, mobile, masculine, active, hot, and upward moving. The sun is considered yang, the moon yin. In the body, the relatively stiff connective tissues (tendons, ligaments, fascia) are yin, while the more mobile and pliable muscles and blood are yang. More passive asanas in yoga are considered yin, whereas the more active, dynamic asanas are yang, because they stimulate the muscles and generate heat.