"Researchers found that people who were told to sit up straight were more likely to believe thoughts they wrote down while in that posture concerning whether they were qualified for a job.
On the other hand, those who were slumped over their desks were less likely to accept these written-down feelings about their own qualifications.
The results show how our body posture can affect not only what others think about us, but also how we think about ourselves, said Richard Petty, co-author of the study and professor of psychology at Ohio State University."
"The end result of this was that when students wrote positive thoughts about themselves, they rated themselves more highly when in the upright than the slouched posture because the upright posture led to confidence in the positive thoughts.
However, when students wrote negative thoughts about themselves, they rated themselves more negatively in the upright than the slouched posture because the upright posture led to more confidence in their negative thoughts."Ohio State University. "Body Posture Affects Confidence In Your Own Thoughts, Study Finds." ScienceDaily 5 October 2009.
Again we see the interconnection between mind and body. Just as feeling confident gives us better posture, better posture makes us more confident.
A wonderful comment I've heard occasionally from clients after their massage is "I feel taller!" What does that do to their confidence in themselves, and how does does it affect others' perception of them? It's all good, as the saying goes.