When calcium is attached to a source of this nature, the body is better able to absorb it and put it to use. Although it can be learn from DVDs, books, magazines, etc, do not attempt it if you are not familiar as it is more difficult that envisage. It is necessary to observe the morals and ethics of yoga in order to lead healthy life. If left uncorrected, misalignments at any level in the spine will affect the nerve supply to different organs, muscles and cells.