A confident person has strong posture.
Very strong posture is not something you can develop overnight. It takes days or weeks of hard work and practice to develop it. To improve your posture: go workout at a gym and focus on your core muscles and exercise on back extension machines. Also adjust your furniture, the way you sit can effect your posture. Always recline and sit back, don't lean forward. Playing video games or sitting at a computer screen can damage posture. when your doing those activities don't slouch, sit back the entire time. Another trick to gaining strong posture is to pull your elbows back when your standing. Walk around with your elbows pulled back and just stay that way all day
