Does Power-posing work?

I was watching this talk by Amy Cuddy from TED (Amy Cuddy: Your body language shapes who you are). Here is the crux of the talk in a few lines.

Our body language is normally a reflection of how we are feeling. Amy and her team of researchers carried out studies to figure out if it works the other way round. In her words,

"Our non-verbals govern how we think and feel about ourselves. Our bodies change our minds"

So she suggests "Fake it, till you make it". Taking up a few power poses can affect how you feel and behave.

But as a bunch of people who facilitate often, have any of you tried PowerPosing just before a session. OR using a typical Power stance to rein-in a conversation. Do you see people in your team take up power poses during a conversation with predictable results?

Inception Game : Open the Magic Box

I am right now in the middle of an Inception. (If you are hearing this term for the first time, in simple terms it is the phase of initiation of an agile project.) A time when you are trying to get your head around a business problem. Understanding a new domain and your immediate scope of work. We usually take the help of a number of interactive exercises to get the stakeholders up and talking about their work. Most of the times we have to tweak our repertoire to adapt to the customer domain and participants in the workshop. This time we came up with a new exercise, which we named as 'Open the Magic Box'.