Have you ever played Beat Saber? It's incredibly fun and a great workout. I didn't think much about VR until I had a kid. I couldn't exactly bring an infant to the gym or on a run. So I used the headset (Oculus Quest) during naps and was instantly hooked.
VR has evolved since then since now. For example, you can connect it to stationary bikes, rowing machines, etc., compete with others, adding a whole new dimension.
Video games and fitness are multi-hundred billion-dollar industries. So why not combine the two? As someone who used to be an avid gamer but no longer has the time, I would love a way to combine my favorite hobby (gaming) with fitness, especially during the winter or other times when exercising outside is inconvenient.