Sauna = Cardiovascular Workout?

Was listening to the latest Huberman Lab podcast, on the benefits of sauna (which I think is a rerun!).

One main point was that more sauna use => healthier cardiovascular systems (lower risk of of cardiovascular death).

I was interested in why this was the case. Apparently, being in a sauna is sort of like exercising! Huberman mentions this in the podcast, and the paper he highlights says:

"Sauna bathing causes an increase in heart rate which is a reaction to the body heat load. Heart rate may be elevated up to 120–150 beats per minute during sauna bathing, corresponding to low- to moderate-intensity physical exercise training for the circulatory system without active muscle work"

Sort of like passive exercising – though I guess some suffering is still involved!