Yin yoga originated in India and China. According to some scholars, the ancient Hatha yoga tradition dates back to the first century of the Common Era, and this developed into Yin yoga as it intertwined with Taoist traditions in China. The idea that asanas should be held for prolonged periods is often associated with the Taoist notion of 'internal alchemy', so the practice took hold as it was said to promote a healthier lifestyle and greater longevity according to that philosophy.