The word nadi comes from the Sanskrit root nada, which means flow. The physical body is structured by an underlying system of nadis. These are subtle flows of vibration. The Upanishads explain that the nadis penetrate the body from the soles of the feet to the crown of the head, carrying prana, the breath of life. The atman is the source of Shakti and the1 animator of all the worlds. The entire network of nadis is so vast that even yogic texts differ in their calculation of the exact number. Regardless of the exact figure, the description of their structure is always the same - thin strand-like threads, similar to those of the lotus stem, which emanate from the spinal column. The science of nadis that is of recent interest to scientists all over the world, had been analyzed extensively by Indian yogis of lore. Through they lacked the physical equipment available to modern science, these yogis through their dedicated practice (Abhyasa), Inner vision (Antardrishti) and self analysis (Swadyaya) had made an extensive number of observations on this concept. Scientific research has been carried out to determine what and where nadis are.

Key words – Nadi, Ida, Pingala, Sushumna and other Principle nadis