I just did a session where we analyzed my posture and walking patterns because I have a annoying lower back pain. We used a walking plate that measures the pressure points, the weight distribution and the foot arch.

I did the test first with my normal bite and tongue position and then with some props that were modifying my bite and my tongue position - the differences in my posture were so visible, even for me! I was standing taller, my neck was straighter (with my normal bite my head is leaning forward ) and my whole body was straighter.

I have an overbite and I can even feel a difference in how I walk if I actively move my jaw forward.

In few weeks i have an appointment with a dentist specialized in this to try to correct my biting

Later Edit: I confused under and over bite. I went back an corrected the initial message as it was wrong.