Hatha yoga the most influential texts of Hatha yoga. It was compiled by Svātmārāma in the 15th century CE from earlier hatha yoga texts. These earlier texts were of Vedanta or non-dual Shaiva orientation. From both, the "Hatha Yoga Pradīpika" borrowed the philosophy of non-duality (advaita). According to James Mallinson, this reliance on non-duality helped Hatha Yoga thrive in the medieval period as non-duality became the "dominant soteriological method in scholarly religious discourse in India". "Hatha Yoga Pradipika" lists 35 great yoga siddhas starting with Adi Natha (Hindu god Shiva) followed by Matsyendranath and Gorakshanath. It includes information about shatkarma (six acts
Ashtanga vinyasa yoga classes in similar style, offering posture variations, and teaching Ashtanga in a much less linear style, with a greater emphasis on alignment and breathing. Sharath's "new generation" of young students have adopted Sharath's new rules, and teach in a linear style without variations. According to the Sharath generation, variations are not allowed, and practice must be in a strict Mysore environment under the guidance of a Sharath-approved teacher. How-to videos & workshops, detailed alignment instructions, and strength-building exercises are not part of the method, neither for the practitioner or the teacher. These types of instruction are not approved by Sharath,