I did it for over year. It's still uncomfortable as I remembered that I always need to mentally get ready. My upper arms, especially triceps, are the most pain

I did it for over year. It's still uncomfortable as I remembered that I always need to mentally get ready. My upper arms, especially triceps, are the most painful, coldest body parts when showered in cold water. I'm not sure why. During winter, I literally had to jump up and down, screaming to withstand the absolutely torturing coldness for the first five seconds. It gets a little better after that. I couldn't never take cold shower too long before the freezing water penetrating the skin and shivering the bone. That's when I know it's time to finish and get out.