Not all race horse trainers require the short stirrups. I galloped race ARABIANS in long stirrups. Those were such funny running horses. Not at all like the TB's.
I used to gallop in the mornings before I started my regular training. It was great exercise and money. Pikes Peak Meadows was half a mile from the farm I trained at.
I must say, I much preferred the TB's. The arab's ears kept going up my nose!!