prayatna-śaithilya-ananta-samāpattibhyām
Combining relaxed concentration and meditation on the qualities of Ananta
This sūtra explains that the practice of āsana in a balanced way leads us to experience an effortless effort, helping you to transition from focusing only on the body (a more superficial layer) to tapping into something infinite but subtle and deep inside (Ananta).
Patañjali explains the method. Take the breath: with an appropriate effort (albeit a semi-conscious one) you can breathe in and out and simultaneously relax. Meditation on the infinite (Ananta) is directed towards internalisation of the eternal life source within you: prana.
Damian Cadman-Jones is an authorised teacher of Prana Vashya Yoga™