Haṭha Yoga Pradīpikā Chapter Two verse 1

अथासने दृधे योगी वशी हितमिताशनः ।
गुरूपदिष्टमार्गेण प्राणायामान् समभ्यसेत् ॥१॥

athāsane dṛdhe yogī vaśī hita mitā aśanaḥ |
guru upadiṣṭa mārgeṇa prāṇāyāmān samabhyaset ||1||

atha - now; an auspicious and inceptive particleāsana - posturedṛḍha - firmyogin - a follower of the yoga systemmārga - wayprāṇāyāma - extending the breathabhyāsa - practice