Thanks Helen, but I would caution the approach. Just the intro offers an important insight into what I would say, is a case of tail wagging the dog...

    "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."

Here's my point, body language is the EFFECT of what you're being within, not the cause. So it offers telltale signs as to some hidden source pain limitation. If you're not confident, work to find out why? Why is it you don't believe in yourself at a core level?

The trouble with manipulating body language to try to get some 'result' in the world, is that we write over the problem, remove the evidence that might point to it, and build an even thicker sense of false self - you put on layers rather than take them off.

This (distorted) approach is rife within the self empowerment/motivation arena out there. So I'd offer a strong caution.