Everything from the info on Breathairianism, to fasting, to Amish, myself, Brother Jimmy, etc. as they become healthy, they seek the cold. It appears that because we live in homes and sleep on beds, our body's lacks the cold it would have contact with if it slept in the wild on the dirt or in a tree. It is normal for a healthy person to want to jump through the ice and excite the skin.
I don't believe in cold shower back and forth with hot shower, the sitz bath is superior to this, BUT if you want that body that can take it all, expose it to cold shower only and it will obey God's Laws and it will firm up and get strong and you don't have to do anything but set there and take it. Outside in the cold rain is better, there you can run/jump/play and the cold will feel normal.