Why is good posture so important?

Not only do you look better but your body moves and ages better which leads to less pain and a decreased chance of injury.  Good posture is also healthier for your heart and lungs.  Try bringing your head forward and see if you can breathe as well.  How well you balance your body in space is a good indicator of how healthy you are.  Weak posture creates pain cycles which teach your body new patterns to adapt and move differently.