Bullet

A bullet, or bullet workout, is a workout that was clocked as the best time for a certain distance on a given day.

Exercise Rider

A rider built much like a jockey but is employed for exercising and working out horses in the morning.

Main Track Only

A horse entered for main track only (MTO) is one hoping the weather forecast or track conditions will move the race off the turf course and onto the main track. They are scratched the morning of the race if the conditions stay dry.