Prakaraṇa 3, verse 18 marks a significant shift in the yogic methodology, moving beyond the static stabilization of āsana towards dynamic purification and control. The instruction to “perform prāṇāyāma” following nādi-śodhana (the purification of the nāḍī channels) signifies a deliberate engagement with the vital prāṇa – that which animates all living beings. The nāḍī system, conceived as a network of subtle channels through which prāṇa flows, is understood to become congested and blocked by negative thoughts and emotions. Prāṇāyāma, or breath control, then becomes the technique to clear these obstructions, restoring the natural flow of prāṇa and facilitating deeper meditative states. This sequential approach—first cleansing the channels, then skillfully manipulating the breath—echoes the broader principles found in the later development of Hatha Yoga, where the mastery of breath is paramount.