Exercise Rider
A rider built much like a jockey but is employed for exercising and working out horses in the morning.
Minus Pool
A pari-mutuel pool – typically a show pool - where one horse is so heavily bet that after deductions there is not enough money left to cover the prescribed minimum on each bet.
Exacta
A bet selecting the first and second horses in a race in the correct order. An exacta box refers to paying a little more to ensure they can finish in either order.