Great article!
Regarding the power poses, I would not recommend this as proof of anything. The study has been proven scientifically wrong. I link you back to a discussion on another article around that topic.
I would say that our body language is more a reflection of our state of mind, meaning that it is influenced by the later and not the reverse. As always, we should be careful with correlations: it doesn’t mean causality.
Anyway, thank you for sharing!