For what kinds of exercises? Does your headset support seeing your surroundings while you exercise, or do you do static sports (treadmill, indoor bicycle)?
I'm not the OP but i play Thrill of the fight (boxing simulator).
For anyone that thinks videogames can't be excercise i suggest you try to do 3 fights in a row on endurance in ToTF.
Although I do have a reason since we are developing our own game VRWorkout (hand tracking based full body exercises and mixed reality for safety), I still get a regular crowd of people joining me in our multiplayer workouts