How do I read my horse's body language to know if training is going well?

Reading a horse's body language during training is one of the most valuable skills a horseman can develop, and it is built through attentive observation over hundreds of hours rather than through any single lesson. Horses communicate continuously through their ears, eyes, mouth, tail, and the tension or softness in their muscles, and a trainer who learns to read those signals accurately can adjust the session in real time rather than discovering after the fact that the horse was stressed, confused, or physically uncomfortable throughout. The ears are the most obvious and readable signal during a training session. Ears that are soft and mobile — swiveling between the rider and the environment with relaxed movement — indicate a horse that is attentive without anxiety. Ears that are pinned flat back indicate pain, fear, or genuine resistance, and continuing to push through that signal without investigating its cause creates a horse that becomes more resistant over time. An ear cocked back toward the rider is a sign of focused attention, and most experienced riders recognize this as one of the more positive signals a horse can give during work. The mouth tells a great deal about tension in the jaw and poll. A horse that chews softly, licks its lips occasionally, or breathes steadily through a relaxed jaw is processing the work and releasing tension. A horse with a clamped, tight jaw that never softens is holding tension through its entire topline, and that tension will show up in the quality of every movement it produces. Licking and chewing after a pressure release is one of the clearest signals that a horse has processed and accepted what was asked of it. The tail is a barometer of tension in the hindquarters and back. A tail that swings freely with the horse's movement indicates a relaxed, swinging back. A tail that is clamped tight, wringing, or swishing aggressively signals tension, pain, or irritation. Consistent tail wringing in a specific maneuver is almost always a physical signal worth investigating. A horse that finishes a session with soft eyes, a relaxed jaw, and easy breathing has had a productive training day regardless of how much was accomplished technically.