One of the toughest things to deal with is a horse that springs off the
hocks, much like an open jumper. I tend to overcompress this type of
horse by asking for way too much in front to control the stride &
spring. The temptation is to ride the trot because the thrust makes
posting a no-brainer.
That's a very good reason to ride with a heart monitor--something I'm
embarrased to admit I don't do--so that you can find the most efficient
heart rate as you train the gait.
Diane @ Safe Haven (real lucky with rocking horse canters)