I believe the person who rides the horses in the races is called a Jockey.
The rider was not ready and expecting it and the rider didn't go with the horse!
The rider of a horse in a race is called a Jockey.
A young horse rider can be called several things: A Young Rider,Junior Rider, or simply Equestrian like an adult.
A race horse rider is called a jockey.
Anyone who rides a horse is just called a 'rider'. Horse rider or equestrian rider are both work as well.
A horse rider is called an equestrian.
Certain riders can be called a cowboy/girl, horseman/woman, or rider.