How to mastery Asana? – patanjali yoga sutra

How to mastery Asana?

2.47.  Prayatnasaithilyananatasamapattibhyam|

• Prayatna-effort
• Saithilya-looseness
• Ananta-the serpent called ananta
• Samapattibhyam-by meditation

By effortless effort and by meditation on the serpent ananta, asana is mastered.