This article offers an interesting take on yoga’s origins. 

Though in the bigger picture, I don’t think the debunking invalidates anything. Even if the author’s claims are 100% accurate in a scholarly sense, is it not possible for a practice to be co-created across cultures and to have value for its practitioners? There are any number of things we do that transcend the myths of origin that some choose to assign to them.

Note: a comparable but infinitely better written and more nuanced article in the TLS recently, too, by the always-brilliant Hinduist Wendy Doniger.