Your voice carries information about your upper body movements.

Fascinating observations by Pouw et al.:

Significance

We show that the human voice carries an acoustic signature of muscle 
tensioning during upper limb movements which can be detected by 
listeners. Specifically, we find that human listeners can synchronize 
their own movements to very subtle wrist movements of a vocalizer only 
by listening to their vocalizations and without any visual contact. This
study shows that the human voice contains information about dynamic 
bodily states, breaking ground for our understanding of the evolution of
spoken language and nonverbal communication. The current findings are 
in line with other research on nonhuman animals, showing that 
vocalizations carry information about bodily states and capacities.

Abstract
We show that the human voice has complex acoustic qualities that are 
directly coupled to peripheral musculoskeletal tensioning of the body, 
such as subtle wrist movements. In this study, human vocalizers produced
a steady-state vocalization while rhythmically moving the wrist or the 
arm at different tempos. Although listeners could only hear and not see 
the vocalizer, they were able to completely synchronize their own 
rhythmic wrist or arm movement with the movement of the vocalizer which 
they perceived in the voice acoustics. This study corroborates recent 
evidence suggesting that the human voice is constrained by bodily 
tensioning affecting the respiratory–vocal system. The current results 
show that the human voice contains a bodily imprint that is directly 
informative for the interpersonal perception of another’s dynamic 
physical states.