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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.
1 Lock your knees, and point your toes back towards your face. Grab the toes and pull your foot backwards slightly on the leg youâre experiencing the charley horse on.  Stand up straight on your tippy-toes and hold it for as long as you can manage. This will stretch the calf muscles and reduce the spasming.