In 2010, researchers at Harvard Business School claimed to have found (PDF) that striking powerful poses caused hormonal and behavioral changes. "Power poses" seemed to raise testosterone, lower ...

Why ‘Power Poses’ Aren’t as Powerful as You Think A recent study found “power poses” like leaning back in your chair produce no changes in hormone levels or risk-taking behavior.

Holding wide, expansive postures – known as power poses – were once thought to boost confidence by producing hormonal changes and making us feel psychologically more powerful.

Power poses let subjects feel more powerful Bodily demonstrations of power, however, influence one's own perception of power, a result that the previous study also found.

Power poses, where we spread our bodies wide or lean back in a relaxed, open manner, actually raise testosterone, which it turns out, significantly changes your demeanor. How do we know?