Whenever I teach and or practice fronts, I always stand up straight and “keep my face in my space”.
In other words, I keep my head/eyes looking between my toes.
When practicing fronts, I do not try to straighten my dog’s sit or path by turning my body or head. If you turn your body and or head, you will inadvertently “gray” the “Line of Front”.
The “Line of Front” is explained in the “Fronts” Class in more detail.