my jacuzzi is a life saver at times

I’ve also wondered if this would help. I have some relief from moist heating pads and hot tubs so it seems it might. Please let us know if you try it.

I have tried finding out about the warning on the door and can't find anything sorry. Just that center parcs do use infrared rooms. Maybe ask when you go for the treatment.
The short time I did go in I was not that impressed it felt like sitting in front of an old fashioned space heater. Think I preferred a normal sauna. Maybe if I had stayed in longer.

Decades ago infrared hest therapy was big and I tried it. It helped a bit, but accupuncture was better.

Can't do a hot tub but a good soak is nice