Two Layers of Stretch
Both layers of tissue need to be kept healthy, so yogis should practice the postures both ways. Yang Yoga is the effort to keep the muscles tensed and engaged. Yin Yoga is the relaxed stressing of the joints.
It is possible to overdue the stretching of muscle or ligaments, but as long as a yogi moves slowly and with little force, the chance of real injury is slight.
Paul Grilley has been studying and teaching yoga since 1979. His special interest in anatomy. He teaches regular workshops on physical and energetic anatomy. Paul lives in Ashland, Oregon with his wife Suzee.