When the Prana is inhaled through the left nostril, then it must be exhaled through the other. When it is inhaled through the right, hold it inside and then exhale through the other nostril. The yamini who practices in this way, through the right and left nostrils, alternately purifies all his nadis within three months.
Hatha Yoga Pradipika II:10

Contracting the throat by bringing the chin to the chest is the Bandha called Jalandhara. It destroys old age and death. That is Jalandhara Bandha which catches the flow of nectar in the throat. It destroys all throat ailments.
Hatha Yoga Pradipika III:70-1

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