What is counter-bending and why is it used in starting young horses?

Counter-bending — asking a horse to bend its nose slightly away from the direction of travel rather than toward it — is a specific suppling and control exercise that Clinton Anderson and other trainers use during the early phases of starting young horses for several practical purposes. The primary use of counter-bending in starting is as a control and softness check. When Anderson mounts a young horse, one of the first things he does before asking for forward movement is ask the horse to flex its nose slightly to each side — not a full lateral bend but a soft tip of the nose. This confirms that the rein is soft and responsive, that the horse's jaw is relaxed rather than braced, and that the handler has basic control available before forward movement begins. A horse that is stiff to this soft counter-flexion has a braced neck and is not in an appropriate state to proceed with riding. Counter-bending is also used to control speed and straightness in young horses that tend to drift or rush. Asking a young horse to tip its nose very slightly to the outside on a circle introduces a mild slowing effect through the outside rein contact, which can soften a horse that is rushing without requiring the pulling-with-both-reins response that tends to create more tension. In the Parelli framework, counter-flexion is part of the refinement of the Porcupine Game — developing the horse's ability to give to pressure in any direction without bracing, which produces the lateral softness that underlies all refined rein work. A horse that can be gently counter-flexed at any gait without stiffening or resisting has developed the kind of neutral responsiveness to rein contact that makes all future rein communication clearer.