Which of the following options correctly describes the action of leverage bits?

Leverage bits are designed to create a mechanical advantage when pressure is applied through the reins, impacting various areas of the horse's head. The correct description indicates that they apply pressure under the chin and at the poll. This type of bit utilizes a shank, which allows the rider to exert greater force with less pressure applied to the reins, making it effective for influencing the horse's movements.

When a rider pulls on the reins, the leverage created by the design of the bit causes simultaneous pressure under the chin and at the poll. This can result in a more effective signal to the horse, prompting it to respond to cues more quickly and clearly. The balanced application of pressure helps in steering and managing the horse’s head position, contributing to overall control and communication between the rider and the horse.

Understanding this function is crucial for horse owners and riders, as it highlights how leverage bits can be used for various training and riding situations. The design and mechanism of leverage bits significantly differ from other types of bits that may apply pressure only to specific areas, leading to a unique method of cueing the horse.