Many horses and humans live with pain to varying degrees on a daily basis. If you've ever been injured or have ongoing pain, think about the all-consuming feeling and emotional state the pain triggered in you.
Horses don't "just" pin their ears when you saddle, get tight or twitch their skin when you touch them, and move away every time you go to mount. If the horse is showing concern, tension, or defensive, please, BEFORE you focus on the "training" first start with your horse's behavior, and assess it for potential pain or discomfort.
