I have a 4 year old Halflinger/Paint that I know would be awesome at reining. He's short & stocky, and he can gallop & stop like no other horse. I know what reining is, but I don't know how to get him to slide stop & pivot fast, he knows how to pivot, but he gets frustrated when I ask him to turn faster, and he will just lock up [ yeah, he's wierd ] . How could I teach him to become an awesome reining horse? Thanks !