The Handbook of Riding Essentials oleh Francois Lemaire de Ruffieu

The natural aids—the seat, the legs, and the hands—are the most important means a rider has to direct and control his/her horse. Mastering them is the key to good horsemanship. The Handbook of Riding Essentials focuses on these aids and explains in detail, not only how to apply them, but why the horse responds to specific aids and when they should be used, thus providing fundamental information that all riders need to know, regardless of their level or chosen discipline.