What does good posture look like?

Good posture involves having a relaxed appearance and a neutral spine. A neutral spine retains three natural curves: a small hollow at the base of the neck, a small roundness at the middle back, and a small hollow in the lower back. When posture is correct, the ears, shoulders, hips, knees, and ankles should align in one straight line.  Essentially, your body is symetrically alligned around your vertical center of mass.