“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.”
– From T Krishnamacharya’s composition,
the Yoga Rahasya Chapter One verse 67