"I've heard horse trainer and clinician Clinton Anderson say that if a horse were not born with a tail, but instead woke up with one tomorrow, he'd spend the day running away from the thing. Horses become desensitized to items that they spend their days with, things they see often: the hay rack, salt block or cat he sees everyday are no big deal. Cows scare "city" horses; they're no problem for ranch horses. You've also seen this desensitizing in action on any horse that won't move forward, despite our kicks: He's learned that the kick doesn't hurt - and frankly, he'd rather just stand there, thank you. Get on a green horse and give him a good kick and you'll likely end up on the ground. The old school horse has become so "used to it" that it (the kicks, the pleadings) have ceased to mean a darn thing."
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"This is called "The Clockwork Exercise" because you need to imagine four very large clocks, one underneath each of your horse's feet. When your horse moves any leg directly forward that leg is "stepping on twelve o'clock." When any leg moves directly back that leg is stepping on six o'clock. Three o'clock is directly to the right, nine o'clock directly to the left, etc. All four legs can step on any of the twelve numbers.
We'll begin very simply. Move your horse off at a walk and pick up your left rein. (At this point this is not a two-handed exercise.) Stare at a very small part of your horse's right shoulder and think of nothing but making it move to the right. Hold your rein with whatever angle and amount of pressure it takes to encourage your horse to move the spot you're focusing on to the right.
It is vital to realize that your horse will not take a big step to the right when you first begin. Don't even look for it, not yet. What you should be looking for (and feeling for) is a very small, very slight leaning to the right. The horse will either lean or slightly lift and lean. Horse training is all about taking small changes and building on them. So, when your horse leans, you let go - immediately. Go forward a few steps as you pet your horse. Repeat. It's also important to drop your reins and pet your horse in between requests. You might find it helpful to very briefly "check your horse back" or slow his speed, before asking for sideways movement in an attempt to divert his forward energy off to the side."