My extensive study of Āsana with TKV Desikachar was shaped around forming a deep appreciation of specific core principles that underpin the planning and practice of Āsana and their application to the individual student’s constitution, psychology and need.
Amongst these dozen or so core principles, the first group I studied when looking at any Āsana in depth, were the concepts of Nāma, Rūpa and Lakṣaṇa, or the name, the form and the characteristics of that particular Āsana.
Obviously the Nāma is a useful tag point for identification and the Rūpa is vital as a reference point for the Sat Viniyoga or appropriate application of the Āsana within overall considerations around direction and outcome such as the Śikṣaṇa Krama, Rakṣaṇa Krama or Cikitsā Krama application of the forms used.
However I do feel these days that our understanding in Āsana practice is dominated by the Nāma and the Rūpa with little emphasis on the Lakṣaṇa or inherent characteristics of the Āsana and how understanding this aspect can have a profound effect on the approach, application and outcome of the overall or accumulative impact of the Āsana within the student’s practice.
The teaching of Krishnamacharya around Āsana included an in-depth appreciation of the Lakṣaṇa, especially around the thirty or so primary support Āsana such as Jaṭhara Parivṛtti, Bhujaṅgāsana or Januśīrṣāsana.