“It is a mistaken concept that certain Āsana are only postures for meditation.
If we look at the commentary of Vyāsa, we see that the postures
he elucidates are so complicated that we can’t be in Dhyāna.
We can feel these different postures and we can’t stay in them.
Two of these are Uṣṭrāsana and Krauñcāsana,
These are very difficult postures in which to remain.”
– TKV Desikachar Religiousness in Yoga Chapter Ten Page 133