No, thanks! I love my HOT showers too much! They soothe me, lol!
The only cold shower I took was absolutely freezing, since our water heater broke in the middle of the winter, and we were living where it was well water. It was absolutely freezing. I think my teeth were chattering for at least a 1/2 hour afterwards.
With the message being about handling stress better. That could very well be, but I'm comfortable with my current stress handling ability.