Even more ubiquitous in the West than mindfulness meditation, and for a longer period of time, is yoga: specifically meaning the practice of postural stretching exercises, with names like “sun salutation” and “downward dog”. They can be supplemented by breathing exercises and perhaps occasionally meditation, and there is often some element of Sanskrit or philosophy involved, but to a normal English-speaking layperson, the core of what yoga means is the postures. This is the sort of yoga that is sometimes even a competitive sport. Its health benefits are rarely contested; as my own aging body gets less naturally flexible, it’s probably only a matter of time before I sign up with a local yoga studio myself.

Meanwhile, in the classical Sanskrit from which the term is derived, yoga refers to a variety of spiritual practices in which postures play a minor role, if any. Śāntideva uses the term “yogin” to describe people with a greater understanding of reality, with postures never being mentioned in the text. The most famous and influential yoga text, the Yoga Sūtras of Patañjali, says that posture (āsana) is one – just one – of the eight limbs of yoga, and the only thing it specifies about posture is that posture should be “firm and pleasant” (sthirasukham) (YS II.46). There’s no stretching involved here; indeed the text suggests the opposite, that one should be comfortable, likely for meditation. The Yoga Bhāṣya commentary – traditionally included with the original – names several kinds of posture without explaining them; when Vācaspati Miśra’s subcommentary does come to explain them, it shows that they are postures for meditation, ways of placing your feet while you sit. Meditation, in general, plays the largest role in this classical yoga; stretching plays none.

So it’s natural to ask: how exactly did we get from one to the other, from a meditative classical yoga in which stretching plays no role, to a modern yoga in which it plays the primary role? I’ve seen this question asked in surprisingly few places. I wanted to get a deeper understanding of that question, so I thought it would be worth reading Elizabeth De Michelis’s 2005 work with the very promising title A History of Modern Yoga.