For untethered, I tend to stick to fitness apps, which is a surprisingly fun way of staying in shape, and beats the boredom of the gym.
I tried Supernatural for a few months. It’s good if you want an instructor led workout and it looks great, but I could not justify the monthly sub
Other great workout apps are synth riders, punch fit, ninja legends, creed, until you fall, pistol whip, gorilla tag, and there’s more.
You’d be surprised to see what makes you sweat
If you want more immersion though, you probably want a wheel set for about $300 and a VR ready PC which ranges from $1200 - $2000 depending on sales and assuming you’re going for midrange. It is game changing though.
When it comes to wheel and pedals you can go cheap and all in one, like the Logitech ones, or push the boat out a bit more like I did with Fanatec gear. Then there's crazy expensive stuff like Heusinkveld.
There are just so much more constraints to get an immersive experience right.