Was almost everything (excluding "seated meditation posture") in western yoga invented in twentieth century?
Wikipedia, for example, states that yoga:
originated in ancient India
And does not carry out the difference between the western and ancient Indian versions.
On the other hand Curtis states that:
It was something very new - that had very little to do with traditional Yoga as it had been practiced for centuries.
modern Yoga was constructed out of Western ideas of gymnastics and a modern Indian political nationalism