Two people walk into their first yoga class. One of them leaves with the most exhilarating experience of their life. The other leaves with a sore neck, and never comes back. Why the difference? Our entire being is like the layers of an onion. The outermost layer is the gross physical body. The next layer down is what feeds this layer, the breath being our most important “food.” This breath layer is linked to a layer of subtle physical energy—the prana, or inner winds.