When the downward action of the martingale is in affect it does not lower the
whole neck starting at the chest, but rather puts downward tension on the poll
and jaw joint , and pushes the front section of the horses head to push out and
up. The opposite of what the rider wants.
If the rider would have arms this long it would replace the running
martingale. Both the horse and rider have a pulling match. The horse
raised the head for a reason and will fight as much as possible. The
reasons vary why the horse does it. Could be that the horse wants to
ignore the rider and grabs the bit, or it could be that the horse has some
discomfort associated with the rider or pain in the body. Sometimes
conformation limits a horses ability, but the rider wants more than is capable.
At this time I did not
include the effects of the rest of the body in the illustrations.