The Ashtanga Vinyasa series is said to have its origin in an ancient text called the Yoga Korunta, compiled by Vamana Rishi, which Krishnamacharya received verbally from his Guru Rama Mohan Brahmachari, Later Krishnamacharya found the manuscript in Kolkata library but was later destroyed. Krishnamacharya has had considerable influence on many of the modern forms of yoga taught today. Among his students were many notable present-day teachers such as K. Pattabhi Jois, B.K.S. Iyengar, Indra Devi, and Krishnamacharya's son T.K.V. Desikachar. Krishnamacharya was well known for tailoring his teachings to address specific concerns of the person or group he was teaching, and a vinyasa series for adolescents is a result of this. Power Yoga is a derivative of Ashthanga Yoga to make Yoga more accessible to the Western audience and to make it easier to adapt. Ashthanga Yoga involves synchronizing the breath with a progressive series of postures—a process producing intense internal heat and a profuse, purifying sweat that detoxifies muscles and organs. The result is improved circulation, a light and strong body, and a calm mind.