I know a bit. I know if you're wanting an atheltic Friesian cross you're goign to want to look for a modern style Friesian. There are two types. The old style, "baroque" smaller thicker carriage type Friesians. Then there are the modern style taller more refined. They normally don't have the over exagerated high knee trot, which is not what you want in dressage anyhow. Keegan is an excellent example of the modern style Friesian, you can see photos of him on my "barn" thing on this forum.