Synth Riders is an excellent music/movement VR workout game. Very similar to the more popular Beat Saber, but totally stands out on it's own with very different mechanics. Instead of standing still slicing blocks with lightsavers, you have to move your arms to touch balls that fly at you in time to music. There's a few different things there like needing to use specific arms again, or holding your arms together, and also sliding along lines instead of always hitting things. Overall, I think it's a better workout than Beat Saber, and comes with excellent music out of the box.