In my 20's I used to swim along the river in wet suit with the diving club. Then 20 years later, it was the training with the rescue dogs club, again in wet suit. Some times we even had to broke the (thin) ice. It was so freaking cold that the fingers can't no longer work. Not only you are like freezing to death, but you can't even undress yourself at the end to get back the dry and warm cloths. It was sunday morning, I was so tired and drained of energy that I often slept the sunday afternoon and needed the monday to recover. After the 7th year, I couldn't stand it anymore. Even my dog became reluctant to swim in the bad season.
But taking a cold shower ? Surely not ! No way, even in summer.
My good water temperature is just under too hot.
I want to feel good, not awoken up, stressed, stimulated or I don't know which so called benefits.