> "It has been suggested that heat stress induces adaptive hormesis mechanisms similar to exercise, and there are reports of cellular effects induced by whole-body hyperthermia in conjunction with oncology-related interventions"

I wonder if the key is simply raising the temperature of the blood. My understanding is that processes like Regenokine extract your blood, elevate its temperature (which causes it to produce natural anti-inflammatory compounds?) and then inject it back into your body. Perhaps sauna (and exercise?) are doing the same, but to a lesser degree. https://en.wikipedia.org/wiki/Autologous_conditioned_serum