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The curb chain applies pressure to the curb groove under a horse's chin when the curb rein of the bit is used. When the curb rein is pulled, the shank of the bit rotates back towards the chest of the horse and the cheek (upper shank) of the bit rotates forward (since it is a lever arm).f used with a loose curb chain, it allows the shanks to rotate more before the curb chain is tight enough to act as a fulcrum and exert pressure. This extra rotation can warn the horse before pressure is exerted on his mouth, so he may respond beforehand.
To do the chin pull, start off with your body and head in its normal position. Then, raise your chin and pull it upwards as far as it can go. You should feel the facial muscles pulling in your throat and chin. Hold your chin in this stretched position for 10 seconds and then relax.