A Mill is a perfect tool you can use to condition an American Pit bull Terrier. Here Are Some Common ones:
A general CARPET MILL. In my expreience carpet mills are best for building strength/cutting fat.
A SLAT MILL. I think there great for building up wind(Stamina)
And A JENNY AKA CatMill. This one is my favorite, This is how Don Mayfield became the best damn conditioner back in the day. Great tool all the way around!
All pictures to respected owners, I found all pictures on Pitoogle.com