Earlier quoted context omitted.
HL Alyx notwithstanding, BeatSaber is a good workout.
Second this, VR is perfect for workouts. I'd also recommend checking out Sprint Vector if you have a decent PC for PCVR (via Steam Link) - I was fully drenched in sweat after a 30 min gameplay session. Gorilla Tag is also nice for workouts while being fun, no PC needed.
So is the real world.