For years instead of hand massage I have used a percussive massager [also called a massage gun] to relax my shoulders and the sides of my neck as part of my vocal warmup. I just read an article quoting a neurologist who thinks using a percussive massager on one's neck is a dangerous practice that could possibly cause a stroke. I don't know if this is a warning all neurologists share but I'm passing the information along. Here's another article with more on the topic. If you want to heed this warning just use your massager on your shoulders, not your neck. On your neck you can go back to good old hand massage and stretches.