Pistol Whip is another great VR fitness game. The first time I played, I could barely walk for a day or two! They've been slowly releasing new maps, and most of those are pretty amazing.

Once you've gotten used to the game, make sure you check out the modifiers. A lot of the settings are great for raising difficulty and making for a good workout. I like to use a combination of dual revolvers (to make you reload more), heavy armor (for enemies), high velocity, and revenge (your shots come back at you).

I'm not good enough at aiming to play with Deadeye on, but that's an eventual goal!