What is the role of the under-girth in horse saddling?

The role of the under-girth in horse saddling is essential for ensuring that the saddle fits properly on the horse. This component, also known as the girth or cinch, secures the saddle to the horse's body and prevents it from shifting while riding. When fastened correctly, it helps distribute the pressure evenly across the horse's back, contributing to comfort and stability for both the horse and the rider.

A properly fitted girth supports the saddle's position, which is critical for effective riding and handling. It helps keep the saddle in place during movement, ensuring that it does not slide forward or back, which can lead to discomfort or injury for the horse. Therefore, the correct answer highlights the importance of the under-girth in achieving an appropriate fit of the saddle on the horse, which is crucial for maintaining the horse’s well-being during riding activities.