Shanmuki Mudra
In Sanskrit, Shan means "six," Mukhi means "face" or "gate" and Mudra means "gesture." This practice is a Mana Mudra meaning "head gesture" practice and is described in the Hatha Yoga Pradipika, Gheranda Samhita as well as the Shiva Samhita.
This Mudra is described as a practice that gives the practitioner the ability to never be polluted by sins. This practice is a practice that represents closing the six gates of perception - the eyes, ears, nose and mouth. This practice redirects the awareness inward by closing the six gates of outer perception.
The best time to preform this practice is in the early morning or before bed and after the practice of Asana and Pranayama and before Meditation.
Practice
Sit in a Meditative Asana or a comfortable seated position.
Place the hands in front of the face with the elbows pointing outward.
Bring the thumbs to the ears and close the ears.
Close the eyes and lightly touch the inner corners of the eyes with the index fingers.
Bring the middle fingers on either side of the nose.
The ring fingers are placed above the mouth.
The pinky fingers are below the mouth.
The six cleansing actions are intended to be the start of a Yoga practice in order to clean, strengthen, remove toxins and improve the flow of Prana through out the practitioner.
Yoga poses help to elongate and strengthen the muscles of the body as well as to calm the mind for the deeper spiritual practices of Yoga.
Breathing exercises are a great practice to remove carbon dioxide, increase lung capacity as well as being a good preparatory practice for the deepest spiritual practice of Yoga, Meditation.
The four body locks that makes up this practice give the practitioner the ability to hold or lock Prana in certain locations of the body. These practices also allow the practitioner to release blockages that may be holding the practitioner back.
The gestures in this practice include the whole body and are intended to awaken Prana, Chakras as well as Kundalini energy within the practitioner.
Meditation is the highest spiritual practice of Yoga which is why this practice is the most difficult practice to preform, but with correct knowledge and dedication, can be the most profound practice of Yoga.