अथ उज्जायी मुखं संयम्य नाडीभ्यां आकृष्य पवनं शनैः । यथा लगति कण्ठात्तु हृदयावधि सस्वनम् ॥ २.५१ ॥

atha ujjāyī mukhaṃ saṃyamya nāḍībhyāṃ ākṛṣya pavanaṃ śanaiḥ । yathā lagati kaṇṭhāttu hṛdayāvadhi sasvanam ॥ 2.51 ॥

Having closed the mouth, inhale slowly through both nostrils in such a way that it (the breath) makes a sound (the sound of inhalation) and it (the breath) can be felt to fill the entire heart region (chest) through the throat.