Due to its effectiveness in helping the horse carry his body with good form, the longe cavesson is arguably one of the most useful pieces of equipment to own. Yet, only a surprisingly small number of riders who know about it. While early depictions from the 16th century refer mostly to its value in lateral poll flexion, its benefits for groundwork extend to a horse’s entire body. For anyone who performs groundwork it is an indispensable tool, as I will explain. Common misalignments of horses during groundwork include a twisted poll that comes from a handler using a line attached under the chin, or one-sided pressure on the bit when using a bridle. The alignment and state of positive — or negative — tension in the poll directly affects the rest of the body.