I had a filly a few years ago who would not go unless I ran the handle of my whip along the corrugated iron fence surrounding the track. Oneday one of the young girls who used to help me took her out and when I came onto the track the girl was yelling and urging the filly to move forward. Later when the filly raced she didn't need the running of the whip along the fence but always needed urging verbally.