4. Raise the prana for eternal youth

Verse 4

உருத்தரித்த நாடியில் ஒடுங்குகின்ற வாயுவைக்

கருத்தினால் இருத்தியே கபாலம் ஏற்றவல்லீரேல்

விருத்தரும் பாலராவீர் மேனியும் சிவந்திடும்

அருள்தரித்த நாதர்பாதம் அம்மைபாதம் உண்மையே.

Translation:

The vital air that abides within the main nādi

Holding it there through mental focus if you are capable of rising it to the skull

The old will become young, the body will glow red,

This is true, I swear by the graceful Lord’s feet and the feet of the Mother.

Commentary:

In this verse, Civavākkiyar explains the concept of kundalini yoga in a nutshell.  Through breath control and mental focus, the prāna is made to travel through the suṣumna nādi and reach the sahasrāra cakra.  When the prāna reaches the sahasrāra, it results in tranquility of the body (cinmaya). A body of light (divya deha) and descent of ambrosia ensues.  Drinking this divine nectar one gets a youthful body.  During kundalini yoga the blood flows at a higher rate thus making the body red.  Sri Ramakrishna Paramahamsa has remarked about this phenomenon when he described his divine experiences.  
Civavākkiyar declares that this is true by swearing on the sacred feet of the Divine.  Nāthan represents Śiva and ammai represents Śakti.  Śiva-Śakti continuum represents consciousness and bliss, the two inseparable concepts.