I have an off the track standardbred who I am trying to teach to canter. I have gone through a natural horsemanship apprenticeship so I am familiar with round penning, cantering up a steep hill on trail, and moving his hindquarters. He will pick up a right lead canter but left lead is out of the question. Sometimes I even try to let him open up and gallop but he seems hesitant. I read an article that says they may be uncomfortable cantering/galloping because of the standardbred conformation. My question is, does anyone have any great exercises that will help build up his muscles for cantering? I do a lot of transition work and he now trots comfortably (he was a pacer in his race days).