Adhyaya 8: Yogasthanas, Ashtanga Yoga, Pranayama-Siddhi, and Shiva-Dhyana leading to Samadhi
व्यानो व्यानामयत्यङ्गं व्याध्यादीनां प्रकोपकः उद्वेजयति मर्माणि उदानो ऽयं प्रकीर्तितः
vyāno vyānāmayatyaṅgaṃ vyādhyādīnāṃ prakopakaḥ udvejayati marmāṇi udāno 'yaṃ prakīrtitaḥ
Vyāna durchdringt und erregt die Glieder und wird zum Anstifter von Krankheiten und anderen Störungen; er beunruhigt die Lebenspunkte (marmas). Dies wird als Udāna in seiner manifesten, aufwühlenden Weise verkündet.
Suta Goswami (narrating Purāṇic teaching on prāṇa-vāyus to the sages of Naimiṣāraṇya)
It frames bodily disturbance as prāṇic imbalance; for Liṅga-upāsanā, steadiness of prāṇa supports steadiness of mind, making japa, dhyāna, and abhiṣeka more effective for loosening pāśa (bondage) and turning the paśu (soul) toward Pati (Śiva).
By implication, Śiva-tattva is the stabilizing Pati beyond the fluctuations of prāṇa; disorders that agitate marmas belong to the field of prakṛti and bondage, while Śiva is the inner ruler who can be realized when prāṇa is brought under discipline.
Prāṇāyāma and prāṇa-saṃyama: calming vyāna/udāna to protect marmas and reduce disease-aggravation, supporting Pāśupata-style inner purification alongside Śiva-mantra japa.