When animals show off their power, they inflate their body and make it look as big as possible. When a man is filled with confidence, he lifts up his head and straightens up his shoulders; and when he is afraid or depressed, he crouches. With the same reason, athletes passing through the finish line first in a race raise their hands high.
Inner feelings are expressed by external attitudes, but what is important is that our inner feelings are also influenced by our external attitudes. An experiment shows that when the test subjects take confident postures by straightening up their body like Wonder Woman, or putting both hands on their waist, or leaning their backs on the chair with their hands behind their head, the hormone that affects confidence increased 20% while the stress hormone decreased 25%. This change occurred just in two minutes.
If you are nervous and depressed when you are about to have an interview or make a presentation in front of many people, take a confident pose in very high spirit. This is the easiest way to reduce tension. It is no exaggeration to say that the result of your work depends on your confidence if you have prepared it hard.