Standardbred horses are a breed known primarily for their speed and endurance in harness racing. They typically stand between 14.2 and 16.2 hands high and have a muscular build, which helps them excel in trotting and pacing events. Their calm temperament makes them suitable for various equestrian activities beyond racing. Originating in the United States in the 19th century, Standardbreds were developed from a mix of Thoroughbreds and other breeds. They are recognized for their unique gaits, particularly the trot and pace, and are often seen in competitions like the Kentucky Derby and other harness racing events.