We arrived early enough to secure our spots on the Seabiscuit Tour, which is free. While we waited for the tram to leave, we watched the horses come out onto the track for their morning work out. Here's a quick video of them coming onto the track.
You've seen this part on TV. The horses are led by the pony horse as they walk, trot, and begin to canter. The horses are then loaded into the starting gate where they wait for the bell.