Adhyaya 8: Yogasthanas, Ashtanga Yoga, Pranayama-Siddhi, and Shiva-Dhyana leading to Samadhi
समजानुस् तथा धीमान् एकजानुरथापिवा समं दृढासनो भूत्वा संहृत्य चरणावुभौ
samajānus tathā dhīmān ekajānurathāpivā samaṃ dṛḍhāsano bhūtvā saṃhṛtya caraṇāvubhau
Пусть мудрый практик сядет либо с обоими коленями на одном уровне, либо с одним коленом приподнятым; утвердившись в прочной и ровной асане, пусть подтянет и упорядочит обе стопы—так устанавливается обуздание тела как опора для созерцания, обращённого к Шиве.
Suta Goswami (narrating Shiva-upasana/yoga discipline to the sages of Naimisharanya)
It prescribes the bodily steadiness (dṛḍhāsana) that makes linga-upāsanā effective—by restraining movement and gathering the limbs, the worshipper supports one-pointed attention toward Pati (Shiva).
Shiva-tattva is approached here as the supreme Pati realized through inner composure; when the pashu (individual self) reduces distraction and steadies the body, the mind becomes fit to turn toward Shiva’s presence.
Āsana-siddhi: sitting in a balanced, firm posture (either both knees level or one-knee posture) and withdrawing/placing the feet properly—preparatory discipline aligned with Pashupata-style meditation and puja.