Pratikriyāsana have counterpostural, compensational and transitional roles
and are applied at specific points in the practice in order to
maintain a sound physiological and psychological base.
This principle has an important role in how
we link the different aspects of the Āsana practice,
how we close the practice or how we integrate the Āsana
element of the practice into other aspects of our Yoga practice.
There are specific guidelines around how
they can be integrated into the practice,
the first of which is that the counter posture needs to
be mastered before a particular Āsana is attempted.