When we talk about Yoga, we find that the word itself has much significance. Yoga means union, merging, joining, connecting, conducting. All these mean Yoga, but how to unite, how to join? Join with what? Yoga is not a thread joining one seam with another. It is not the joint where two pieces of pipe are connected. It is not the joining of two persons together.
Most in the modern-day practitioners of yoga are unveiled in this ancient art from the lure of physical exercise.
According to Yogic physiology and philosophy, three main Nadis exist within the frame of the spinal column – Ida, Pingala and Sushumna. Ida and Pingala are responsible for the two sides of human nature coexisting within every individual. Ida is the introverted, mental side of our personality and represents the lunar, subjective and receptive aspect of our being.