Everyone has different ideas and techniques for warming up the horse. Some people like magnetic blankets, a certain grooming routine, or lunging before mounting. If you’re interested in incorporating a basic massage technique to warm up your horse’s back muscles before tacking up and riding, this is a good starter video.
Finding your horse’s favorite warm up is often trial and error, but the good news about this type of massage is that it’s simple to try and it’s virtually impossible to hurt your horse doing it. Give it a try and see how your horse responds.