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The running martingale has only one purpose, which is to prevent the horse from throwing its head too high when taken by the bit, especially when taken back. This is why it was primarily used on green horses that did not know how to respond to the bit.
The running martingale. Martingales help give the rider extra control by preventing the horse from raising their head beyond the point of control. Many riders like to use a martingale when jumping, especially on a young or strong horse. The running martingale branches into two straps, with a ring at the end of each through which the reins pass. It works by stabilising the reins and bit and applying downward pressure on the mouth when the horse raises his head too high.