What to choose between Chambon, German martingale or Draw Rein to encourage a young horse to strench down and engage his back, and why ?

Chambon because it is not used when riding directly by the rider therefore you can make it on a loose, comfortable setting and it will stay consistent. Draw reins/martingale are either controlled by the rider or it will not be long enough if the horse wants to stretch lower than the martingale is allowing
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