Asana refers to the physical component of yoga. Practicing asana requires an awareness of your body, your posture, and gravity. The spine is of particular importance in asana because it is the central supporting system for your entire body. If your day has ever been foiled by a back attack, you understand how intimately the spine is connected to other body parts. All asana, whether they are done sitting, standing erect, or standing on your head, involve movement of the spinal column.
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