Yvonne Zobell instructs the following:
Yin yoga, is designed to create space within the body holding asanas (yoga postures) for longer periods of time allowing the body to relax, surrender and open. This class consists of passive floor postures held for 1-5 minutes. Holding these postures for longer periods of time gives the muscles time to relax so that the connective tissues can begin to open.
This class offers the balancing affects of yang style and yin style yoga. Yang yoga is active and powerful. Yin is passive, restorative and relaxed. The first half of the class is a dynamic flow sequence consisting of standing and balancing postures or the yang part of class. The second half of the class focuses on the long, slow stretches or the yin.