Your posture bolsters your self-confidence.

That’s not us talking — it’s a group of researchers led by Richard Petty of Ohio State. In a study of undergraduates, the kids were directed to either sit up straight or slump while filling out a job application. Those who sat up straight were far more confident than the slumpers that they’d get the job.

The implications for interviews couldn’t be more clear: whether you are talking via phone or in person, put your shoulders back and straighten your spine. Your body language will become your message.