In this picture and you see a horse that is what we call "on the bit" (sometimes called by novices "tucking the head in") But "On the Bit" is what horse people, horse trainers, instructors, clinicians, and judges use to describe the horse within a proper arch through the neck and relaxation from the poll, which appears as a head tucked in. Actually, however what these professionals are looking for is a correctly moving horse- not just a pretty head. When a horse is correctly on the bits, their head isn't pulled back, but relaxed and swinging from the first vertebrate of the neck. The head hangs relaxed and gives the appearance of the horse having their head on the bit.
