A third factor, that of Respect for Responses

3. Voluntary,
as in controlled action
and involuntary,
as in action or reaction
without conscious control,
have both positive and negative aspects.
For example, a person who has a particular
problem would seemingly come voluntarily.
However, their reaction in response to
what we ask them to do may be involuntary.
So we have to consider a person’s responses.
As in, what are and what are not
acceptable responses when we travel
from everyday postures to Yoga Āsana.

Āsana Mudrā & Prāṇāyāma
– Collected Viniyoga of Practice Planning Principles

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