Boy horses just love to through new things into the mix, don't they? After our rides in the ring, I take my horse around the hay fields for a nice little fun ride. We mostly trot and canter it. The past few times out, the last part where we canter, he's tried to break into a run. When I tell him no by sitting back and not giving him anymore rein, he bucks and tries harder to get his way. Luckily he's not a very good bucker, so I've been able to ride out his little fits without landing on the ground. He's a good boy and does give up quickly once I tell him to knock it off and bring him back to a trot or walk. My question is, what should I do to nip this in the bud? I've spent the past few months putting weight and muscle on him. His ring training is going great, and I know he's feeling good. Since he does give up fairly easily, I'm not sure if I should just act like nothing happened, or be more proactive in letting him know he's not going to get his way. The next time he does it, after I get him back to a trot, should I let him go back to canter again? Bring him back to walk? Turn him back the other way? I don't want to do more correction than necessary. He's an OTTB and sometimes enjoys messing with my head. If I do too much, he might decide to throw more at me. He's a doll but has a playful sinister side to him. He's very smart, so I need to get this resolved before he gets me off and figures out that's the ticket to going home.