From TED.com: “Body language affects how others see us, but it may also change how we see ourselves. Social psychologist Amy Cuddy shows how ‘power posing’ — standing in a posture of confidence, even when we don’t feel confident — can affect testosterone and cortisol levels in the brain, and might even have an impact on our chances for success.”

This link has transcripts in multiple languages:

http://www.ted.com/talks/amy_cuddy_your_body_language_shapes_who_you_are.html