On practice
Yoga Sutras 2.46
Source: verified public-domain translation.
Original text
स्थिरसुखमासनम् ॥
Transliteration
sthira-sukham āsanam
Translation
“Posture is that which is steady and easy.”
Translation · James Haughton Woods
Context
Asana in Patanjali is a seat stable enough for further practice, not a catalogue of modern studio poses. The two qualities are sthira (steady) and sukha (ease).