recapūraka kumbheṣu mano’nusaraṇaṃ smṛtam |
recapūraka kumbhākhyāḥ sarve prāṇavidhārakāḥ ||

“Mind should follow the breath.
Exhale, Inhale and Retention support life.
So during Āsana it is desirable that the mind must follow them.”
– TKV Desikachar commentary on T Krishnamacharya’s composition, the Yoga Rahasya Chapter One verse 34