are you lifting weights and exercising? If not get on it ASAP. Revert back to the physical-activity-heavy lifestyle of our ancestors and you'll feel better
Active VR games are a legitimate cardio workout. Sites like https://www.vrfitnessinsider.com/reviews/ have real data if you don't believe me.
As for duration, I've seen people (including myself) happily play Beat Saber for hours who don't last 10 miserable minutes on a treadmill.
Just put your routine in a FOR-loop and grind for increased STRength and STAmina stats lol