Most racetracks require all horses to go around the track at least once sometime before they are called out for post parade. Call it a warm up but it is usually mandated by the racing laws of the state where the race is being contested or by the racing rules of the particular track. Especially in this age of simulcasting, it gives the betting public a look at the horse before he races so they can make their own evaluation as to whether they want to wager on him.