First of all she sat in the required sitting posture, and then she carried the life air upwards and placed it in the position of equilibrium near the navel. Then she raised her life air, mixed with intelligence, to the heart and then gradually towards the pulmonary passage, and from there to between her eyebrows.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
कृत्वा समानावनिलौ जितासना सोदानमुत्थाप्य च नाभिचक्रतः । शनैर्हृदि स्थाप्य धियोरसि स्थितं कण्ठाद्भ्रुवोर्मध्यमनिन्दितानयत्
kṛtvā samānāvanilau jitāsanā sodānamutthāpya ca nābhicakrataḥ | śanairhṛdi sthāpya dhiyorasi sthitaṃ kaṇṭhādbhruvormadhyamaninditānayat
SB 4.4.25