Oh he'll muscle up! I started out English before I decided to venture into barrel racing about 11 years ago lol, I LOVE off the track horses! Just do lots of long trotting, carrying his body properly, rollbacks and lots of work going up and down hills, I personally like to back them up hills! Sounds like you've got an awesome horse! Take him on a big stretch and push him into a gallop, don't touch his mouth just let him run, use your body and legs to urge him forward, he probably isn't used to really stretching out and running without a lot of contact, jockeys can be tight on their mouths!
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