Searching for Yin Yoga

I recently began reading Bernie Clark's book Complete Guide to Yin Yoga. Bernie is at the forefront of the Yin movement, and I have been curious for awhile now about the purpose and intention behind the practice of Yin.

Yin Yoga, a practice with long holds (1-5 minutes), has been available at our home yoga studio for many years. I have taken dozens of classes. They are slow, occasionally relaxing and sometimes quite intense as the body opens up. One of our closest yoga teaching friends is the local authority on Yin.

Even though I have read several books and attended many classes, I have never been able to fully comprehend the purpose of the Yin practice. Is it for the tendons, ligaments, fascia or muscles? Is it even healthy for the body to stretch some of these tissues?

Bernie Clark's book is well-written and informative. He draws much of his knowledge and inspiration from martial arts, which is oddly comforting since I too started there. For me, the jury is still out on Yin Yoga. My understanding is growing, but I must admit that I am skeptical. I will continue to read and practice.