pracchardanavidhāraṇābhyāṃ vā prāṇasya [YS 1.34]

kauṣṭhyasya vāyor nāsikāpuṭābhyāṃ prayatnaviśeṣād vamanaṃ pracchardanam, vidhāraṇaṃ prāṇāyāmas tābhyāṃ vā manasaḥ sthitiṃ saṃpādayet.