viniyoga adhyāyaḥ
Chapter on Application
yayā vṛtyā prāṇavāyoḥ dairghyaṃ dine dine| vardhete ca viniḥ bādhaṃ vṛttiṃ tām-anusaṃcaret ‖
Encompass that which promotes the length and subtlety of the breath as an activity to be followed everyday.
sthiti-krama-anurodhena gṛhiṇām yoga-sādhane | prāṇāyāmo mukhyatama iti me matam-uttamam ||
In the Sthiti Krama the most important Yoga Sādhana for the householder, according to my view, is Prāṇāyāma.