“There are simple postures for Prāṇāyāma and Dhyāna,
so that we can relax in the body and not be distracted by it.
There are challenging postures, to enable us to master our bodies and
for young people who will be engaged by the performance aspect of the posture.
There are also corrective postures.”
– From study notes with TKV Desikachar England 1992