Excerpts from “What is Yoga?” The Aquarian Teacher Level 1 Teacher Training Manual
The physical or gross body is the first facet you must master and understand as a human being. It is your vehicle to travel through this life. The balance of the physical vehicle affects the rest of your capacity and experience. If you want to test the reality of this claim, just overeat consistently for a few days and you will understand.
In New York I met a person whose case proved this. I asked him, "Why are you on welfare?" He said, "I can’t hold myself together." It surprised me. He had intelligence, nervous capacity, and friends. His problem was that he overate. Every ten or fifteen days, he would get sick and go to the hospital. After he got out they would ask him to take precautions and not do it again. But he would immediately overeat, get sick, and go back in. It was a powerful cycle. Overeating destroyed the balance of his whole system. It blocked any other aspiration and goal he had. Overeat even one time and you upset your body.
The physical body is the basic temple in which you can deposit the treasure of happiness in life. When you are young you can play mischief with the physical body. But in old age the body has you paying for the playing. You cannot escape this fact. The body does not forgive your actions, it only records the results of the actions.
Kundalini Yoga teaches you the techniques and awareness to stay healthy. You gain a strong immune system, vital glands, a strong nervous system, good circulation, and an awareness of the impact of your habits. This foundation gives you energy and lets you deal with the mental and spiritual facets of your life.
In Kundalini Yoga, you study the human body in the light of yoga therapy. You must understand it and learn how you can make the best use of it. You must be able to keep it on the level of consciousness you choose, so that it can serve you better and better, without a lot of trouble. That’s the maximum you can do.
©The Teachings of Yogi Bhajan