The natural light is not going to do you any good when you put on a helmet that blacks all light. The actual light on your eyes is like having giant monitors all around you. You don't get any UV indoors either because of the glass. On a beach you'll get sand in it and the device and batteries probably get too hot. I find AirPods Max uncomfortably hot in summer, and they only cover my ears.

Standing desks with treadmills already exist and my understanding is that they make keyboard and mouse control more difficult. But even something like code review while walking sounds difficult.

So: do sitting work, go for a walk, do more sitting work, go for a walk,etc