For those that may not know, I like to play poker. I think I'm pretty good at it. I like to play poker because contrary to what you may believe poker, is 70% reading people and 30% playing cards.
I recently read a book called "Read'em and Reap". It's an FBI interrogator's guide to understanding the instinctual moves that people make, specifically how it pertains to the Poker tables. Reading "tells" is what us poker players call it. But reading tells is done in almost every aspect of my life. Anyway, I strongly suggest you read this if you are into poker in any way or are interested in understanding body language.
One interesting fact: Did you know that your feet are the most "honest" part of your body. Your face is the least truthful. Information like this can be used outside of the poker room.
For example: Say you're having a conversation with someone and can't quite tell if they're actually getting it. Look at their feet. If thy're pointed directly at you, the person is engaged and listening and most likely right with you.
However if the feet are at a diagonal, or worse yet pointed away, they are not into the conversation and quite likely want to get out of it.
On the same thought, have you ever walked up to a conversation and wanted to participate but felt shut out? Try aligning your feet with everyone. For some reason you'll be swept right into the mix.
We do a lot of this instinctively, but knowing when to do it purposefully can be a powerful thing.
So get out there and let your feet tell the world all about you.