We've all had a Polly or Peter Pretzel in our yoga class, and admit it — you can't help but ogle a little at their awe-inspiring strength and flexibility. It's inspirational, and it gives a little insight into what years of practice can lead you to. But let's face it: some poses are just flat-out out of the question. Get ready to be wowed when you see these amazing advanced yoga poses. Would you try them?