I don't know, I've tried turning the water icy cold for the last few minutes of the shower (based on an Art of Manliness article), and it seems like trying to a

I don't know, I've tried turning the water icy cold for the last few minutes of the shower (based on an Art of Manliness article), and it seems like trying to artificially create meaning in something very trivial. I think there's value in changing things up so you don't get too comfortable, but to me this is about as meaningful or important as changing which brand of deodorant you use. Instead, I'd recommend things like going to see a play, listening to a new genre of music, taking cooking classes, etc.