Prayer for Lord Shiva who is the father and founder of Hatha Yoga system;
Mantra:
ॐ श्रीआदिनाथाय नमोsस्तु तस्मै येनोपदिष्टा हठयोगविघा !
विभ्राजते प्रोन्नत राजयोगम् आरोदुमिच्छोर धिरोहिणीव !!
Om Shri aadinaathaaya Namosatu tasmay Yenoupdishta hathyogavidhya !
Vibhrajte Pronntraaj Yogm aarodumichcor-dirohiniva !!
Meaning:
Reverence to Shiva the Lord of Yoga, who taught [his wife] Parvati hatha wisdom as the first step to the pinnacle of raja yoga.
This mantra is from Hatha Yoga Pradipika by Swami Swatamaram