In this Pranayama, the Bhavana is more important than the ratio between Puraka, Kumbhaka and Rechaka.
Sit in Padma or Siddha Asana, facing the East or the North.
After mentally prostrating to the lotus-feet of the Sat-guru and reciting Stotras in praise of God and Guru, commence doing this Pranayama which will easily lead to the awakening of the Kundalini.
Inhale deeply, without making any sound.
As you inhale, feel that the Kundalini lying dormant in the Muladhara Chakra is awakened and is going up from Chakra to Chakra. At the conclusion of the Puraka, have the Bhavana that the Kundalini has reached the Sahasrara. The more vivid the visualisation of Chakra after Chakra, the more rapid will be your progress in this Sadhana.
Retain the breath for a short while. Repeat the Pranava or your Ishta Mantra. Concentrate on the Sahasrara Chakra. Feel that by the Grace of Mother Kundalini, the darkness of ignorance enveloping your soul has been dispelled. Feel that your whole being is pervaded by light, power and wisdom.
Slowly exhale now. And, as you exhale feel that the Kundalini Shakti is gradually descending from the Sahasrara, and from Chakra to Chakra, to the Muladhara Chakra.
Now begin the process again.
It is impossible to extol this wonderful Pranayama adequately. It is the magic wand for attaining perfection very quickly. Even a few days’ practice will convince you of its remarkable glory. Start from today, this very moment.
May God bless you with joy, bliss and immortality. -- SRI SWAMI SIVANANDA A DIVINE LIFE SOCIETY