Based on the Hatha work of Swami Sivananda and developed by Swami Vishnu Devananda, the series is flowing, restful and challenging. Featuring the headstand and other inversions, as well as bends and twists, the series will lengthen and strengthen you. Your balance & flexibility will improve. You are guaranteed to feel refreshed and relaxed. The essence of his teachings can be summarized in the aphorism "Serve, Love, Give, Purify, Meditate, Realize,"