I love seeing accomplished drummers move. Their entire body seems to get involved AND everything seems to be effortless. I have spent countless hours examining my own movements, especially my arm motion. No matter the style of music (or volume), my arms are moving. This includes everything from a very soft orchestral (or multiple bounce) roll to the more aggressive drumming needed for rock, R&B, etc.
I am still working on this by doing anything I can to encourage my arms to simply move. My goal is that my left arm will some day have the ability to move with the ease that my right arm currently enjoys. I practice, but I also try things away from the drum set — basically, anything I would normally do with my right arm/hand. Try it and see if your brain starts to send a more similar message to that part of your body.