Carrying your horses favorite treat on you in your pocket is a good way I've learned. Give it to him when he does what you ask once it twice at walk and trot to make him aware you have it, then only give it to him when he stays with you at the canter. Start with a few then usually you can slowly ease them off and just give it to them after every good training session. I work with Arabians and it seems to work out great!
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