Stride

 I was looking at people's gaits the other day. You could easily see degrees of relaxation, tension. How athletic the person might be. The angle of the back, depending on the weight of the student's backpack, the way the shoes affected how far the feet could rise from the ground, the way having arms in front holding phone distorted natural movements. Older people with shorter steps. You could recognize someone you know from their gait alone, like my daughter once told me they did in Chicago in the Winter, when the face was not visible under hats and scarves.  Facial expressions, though, are also informational on a warm day: a look of determination on the face and a determined, tense stride forward. A person walking slowly and with sort steps, and seeming to hug themselves in a comforting way.  

Then it occurred to me that this was also how you could read someone's voice. All the suprasegmental stuff is also informational, affected by tension or relaxation, or simply expressive of an attitude.