This head and neck-position is also known as hyperflexion (rollkur). The neck is absolutely overstretched which lifts the back over the withers in an extreme way. The horse loses its dynamic movement. With this position of head and neck the horse also loses its hindquarters, and the center of gravity shifts to the forehand. Riding a horse with a hollowed or braced back increases the wear and tear on its connective and supportive tissue.