Good posture

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"Your brain is constantly checking in with the rest of your body to find out how you're feeling," says Kelly McGonigal, PhD, a health psychologist at Stanford University. "When your posture is erect, the message it gets is: I feel good about myself." One study, published last year in the European Journal of Social Psychology, found that subjects who sat up straight in their chairs instead of slouching were more confident about statements they wrote. Keeping your shoulders back and chest open also makes you look taller, slimmer, and radiantly self-assured.

For some ideas on where to start, try O's posture exercise plan.