During the practice one must constantly engage
in regulating the exhale, inhale and retention.
Ujjāyī is to be smooth and slow,
according to the strength or capability of the student.
Uḍḍīyāna Bandha is a pre-requisite for the
other two Bandha, Jālandhara and Mūla.
From the practice of Uḍḍīyāna Bandha the
Nāḍī and Cakra become purified and strengthened.