This sounds like what we do at the hot mineral spring baths in "Termales" [Thermal Waters] Santa Rosa, Colombia.
They have water that channels down the mountain from natural icy cold springs channeled into showers about the size of a large adult's thigh.
They also have dug the rock (mountain) into pools, where natural mineral hot springs pool.
They also put slides (same as public pools) by the cold showers
Soo... We would go soak our feet to get used to the hot ... little by little get into the hot pools, then go 1 - 2- 3 BOOOM under the ICY COLD BIG shower, stay as long as you could and run and jump or slide into the hot pools. Time and time again! Lovely.
Everyone would have to make the trip every so often for the experience and most for health...
Sounds so much like what you are saying, I had to share.
You are the best.... (remind me of my father... tough... but very wise [his nickname: here comes THE LAW! heheheh....)