Ever since I got my gelding Licorice he's always been afraid of the lunge whip, making it a battle to get him to lunge. After about a year of working with him I've been able to get out on a circle. But every time I pick up the whip he immediately starts off at a fast trot and won't stop when asked. When I was lunging him tonight he kept stopping and turning to go the other way. I always loop the lunge line through the bit and over her his head. When I get him stopped to make him go the other way he'll back up, so I'll swing the rope out behind him to make him go forwards, but he has started to swing around and rear up, striking with his hooves at the whip. I've only ever touched him with the whip once, last summer, when he donkey kicked at him. What can I do to make him stop striking out?