Option 1: Trotting -> A two-beat diagonal gait where the horse moves at a moderate pace.
Option 2: Cantering -> A three-beat gait that is faster than a trot but slower than a gallop.
Option 3: Galloping -> The fastest natural gait of a horse where all four hooves leave the ground.
Option 4: Spinning -> Not a recognized horse gait; while horses can turn or spin, this is not a standard movement term.
Hence, Option 4: Spinning -> Trotting, cantering, and galloping are all natural gaits of a horse, whereas spinning is not a standard equestrian term for horse movement -> correct