a person rides a horse
the horse is running
a horse runs while a person rides it
the horse is brown 
the rider wears blue
the rider wears a helmet 
the rider races the horse down a dirt racetrack
the racetrack is dirt
the horse has a white cloth under the saddle 
a railing next to the track
brown race horse running on track
a rider is on a race horse
a white blanket is under the horse saddle
the rider stands in the stirrups
the rider has a blue helmet on
a white fence beside the track
the horse is galloping down the track
the rider is wearing blue
The person is riding a racehorse.
The horse is running on dirt.
The railing is white.
a race horse
a brown horse riding on dirt in field with a man riding on another brown horse behind it