Although the idea of purposely exposing yourself to the kind of temperatures that make a medium look like an extra small may not sound like a good idea, you may be supprised.
Taking cold showers can have several benenfits with only one tiny drawback (hoi).
In the morning a cold shower can,
-increase testosterone, didn't see that one coming did you
-wake you up, if you've ever accidently hopped in while its still cold you know this feeling
-resets breathing, especially the first time, when that water runs over your chest an uncontrolable urge for deep breaths may take over
-motivation, cold showers can energize you and get you ready for a productive day
-improve circulation, your body reacts to the cold water by hoarding blood in the torso protecting organs, when you get out the blood starts pumping blood back into the extremeties
If you become more comfortable you can use cold water with your regular showering routine, if not just turn the dial to cold for atleast 60 seconds before you get out. Good luck brave souls.