If a horse is strong; be it in the field, school, on the ground, jumping or cantering, a rider or handler’s natural reaction is to pull the reins or hold on tighter. This creates a static pull and unfortunately isn’t that effective.
For this post, we’re ignoring the rest of the aids and body language, because I feel that this area is often most misunderstood by novice riders.
Imagine you are trying to push someone over who’s bigger than you. If you just lean your body weight against them then they will adjust their centre of gravity and lean against you, thus making them more stable and harder to push over. This is exactly what happens if you pull statically on your reins, or the lead rein if you’re on the ground. The horse will lean against you akin to a tug of war. Because they are so much heavier (ten times is the suggested ratio) gravity works in their favour and ultimately you will lose.
Going back to pushing someone over. Tactically, it is much better to give a series of smaller pushes, so unbalancing them and preventing them securing their centre of gravity against you. Now back to the horse scenario. A series of squeezes/jerks/tugs, whatever you wish to call them, is more effective at directing the horse and monitoring their speed.
Think of it as a give and take, or squeeze and release. You maintain the contact, be it lead rope or reins, but use your hand to apply pressure, then as the horse responds (however marginal) you relax the fingers. Don’t push hands forward because that will allow the horse to rush again. The release rewards the horse for his slight reaction, and reapplying the pressure repeatedly stops them leaning against you and means that they maintain respect for the aids.
From a driving perspective, you want to imagine you’re slowing decreasing your speed. So from 60mph, to 55, to 50 and so on. If you squeeze the rein yet drop the contact between squeezes it’s like alternating between the brake and accelerator. Some horses, like when you’re driving downhill, need frequent taps on the brake (half halts) to stop them rushing out their rhythm.
It’s a hard thing to get your head around, especially when faced with a horse who doesn’t want to stop cantering across the field, because it’s an automatic reaction when self preservation kicks in, but ask your horse to steady in small increments with a series of half halts rather than trying to win a tug of war and bring them to an emergency halt. Practice in the school, in a simulated environment so that you feel more confident out hacking and in open spaces, as well as training your brain.