He TOTALLY needs an adjustment. After test ride one I ran the brush over his back and he was SORE in the lower back, the trainer says it is just muscle fatigue from arena work, I do not agree. He felt and looked sound when riding, but was going somewhat hollow just with his head down. I think he is being ridden front to back so to speak, and that is making him sore. But that stuff is not hard to fix. Proper riding and a chiro visit should set him right.