Next time you feel nervous, put your feet up on your desk. Really. Assuming a powerful pose spurs a neuroendocrine shift that actually makes you physiologically more powerful. In a study conducted by researchers at Harvard and Columbia universities, subjects assumed "high power" poses for two minutes: First they put their feet up. Then they stood up and leaned on their hands over a desk. As a result, their testosterone spiked by 19 percent and the stress hormone cortisol fell by 25 percent.