Different Types of Postural Activity in Āsana Practice

9. Furthermore, the consideration of movement
or stasis sits within a relationship to the
deeper purpose of Āsana within our journey
through the body and the breath, to the mind
and beyond, through considerations such as:
In relation to the dual concepts of Sthira and Sukham.
Dynamic can be too much effort, as in overly Sthira,
and Static can be too relaxing, as in overly Sukham.
Thus, the use of movement and stasis in Āsana needs
to consider how to correlate these two qualities, namely
that of steady attentiveness with that of spacious clarity.

Āsana Mudrā & Prāṇāyāma
– Collected Viniyoga of Practice Planning Principles

Āsana Mudrā & Prāṇāyāma
– Collected Practice Planning and Practice Theory Questions