Only by the contraction of the throat, the two nāḍīs should be firmly stopped.This is known as the middle chakra, the bundle of the sixteen ādhāras.

This verse reveals deep technical aspects of Jālandhara.Dvau nāḍau — the two nāḍīs — refers to iḍā and piṅgalā, the lunar and solar channels that flank suṣumṇā.By contracting the throat, these channels become “stopped” (stambhayet), forcing the prāṇa to enter the central channel.

Madhya-cakram — “middle chakra” — identifies the throat as a central point in the subtle geography of the body.Viśuddhi is equidistant between the lower centers (mūlādhāra, svādhiṣṭhāna, maṇipūra) and the higher ones (ājñā, sahasrāra), functioning as a bridge between the gross and the subtle.

Ṣoḍaśādhāra-bandhanam — “the binding of the sixteen ādhāras” — is a technical term.The ādhāras are points of support or concentration in the subtle body.The system of sixteen ādhāras is a yogic mapping of the pranic body, and Jālandhara bandha integrates them all by sealing the key point of the throat, creating unity in the energy system.