[QUOTE=Feliz;8657735]
Can you elaborate more on this? Why does it help with not taking rails?[/QUOTE]
A lot of jumpers will have rails because, at a show, sometimes the training (which you aim to have perfectly smooth) goes awry and it’s better to have the RM there as a backup in case. Appropriately adjusted it does absolutely nothing when all goes well. However, when you need it, it’s very useful. Most rails come from slight horse-rider miscommunications if you have a basically careful horse – it can help prevent them.
Say you are coming around the corner and see that you need to half halt to get your distance. (let’s not argue about whether, as riders, we ought to see distances. Assume that on a jumper, you ought to get your horse to a reasonable distance AND have a good canter.)
So, your horse is excited, and he comes around the corner and tosses his head. Now, I know that’s not ideal – also assume that at home he doesn’t do this, but just this once the horse does, and you have to deal with it while you are approaching a fence on course. That’s called “life”. the RM, properly adjusted, comes into practice. He settles, shortens his stride in time with his rear end still engaged, and you get a reasonable distance to the fence still in a nice canter. You jump that fence clean, and land in a good canter ready to continue four strides ahead to the next fence.
Say you don’t have a RM. Your horse tosses his head and there is nothing there to do anything about it. the half halt is less effective and so he bounds a bit past the distance you wanted, not to mention your canter is all over the place now and he’s strung out. You are deeper than you wanted and his hind end is not underneath him, so he has less power to get out of the poor distance you let him get to. Your chance of clearing this fence depends on how much scope and heart he’s got and how clever he is with his feet.
He will land on the other side very likely either not going forward at all, because he was careful and twisted in the air and hung up the forward motion trying to get himself over the first fence without hitting it. You’ll have to boot him forward to get down the line to fence #2. If you make it there on the decent distance, he’ll be even more strung out and you’ll be DARN dependent on his good will, adjustability, and heart to get over it clean. You might have simply taken too much power away from him for it to be possible for him to clear the back rail of the oxer at all. Do this enough times and the horse will not have much confidence left.
Option 2 is that the horse might be going forward and just hits out the top rail of the first fence and you can keep on a steady pace to the second on the four strides, even though you got it too close. if it’s a sensitive horse, it might get spooked a bit having had a rail and have to half halt down the line to get the distance. Here again your martingale might help you steady it.
Either way, it’s better to have the darn running martingale when that kind of thing happens. Of course, there are lots of rails when it would make no difference at all. and 99% of the time, it makes no difference at all when my horses wear one. It isn’t there to replace good training. It’s there to step in when the good training has a bad day. Because they aren’t machines, and neither am I. Far from it!