I've found a yoga teacher who is good at this - reasonably authentic yoga but without a requirement for superstition etc. I'd be surprised if he were the only t

I've found a yoga teacher who is good at this - reasonably authentic yoga but without a requirement for superstition etc. I'd be surprised if he were the only teacher like that around - but it might take a bit more hunting out that the other types you mention (both of which I have encountered too!).