Jalandhar bandha (the Chin lock)
Sit in padmasana, place the palms on top of the knees. Relax the whole body and close the eyes. Inhale deeply, retain the breath inside, bend the head forward and press the chin tightly against the chest. Stay as long as you are comfortably able to retain the breath, then raise the head and exhale. Repeat when the respiration returns to normal. Air is totally sealed in the thoracic region. It is directly related to vishudha chakra that is responsible for storing the energy in the form of prana to strengthen the sushumna nadi.
The voice becomes clear and pleasant. All the diseases of thyroid and para- thyroid are cured. It relieves stress, anxiety and anger.