I'm sure we can find a bizarre cult/motivational speaker/pyramid scheme to disagree with anything though.

Why start the shower full cold? (I end showers cold, not sure if 1 minute, sometimes less sometimes more depending on mood)

I start with full cold because it's more of a shock to the system. I find the cold water improves my mood and provides a daily dose of "suck it up, buttercup". I've __almost__ started crave that cold shock in the mornings now, and the cold water at the end of the hot shower feels like .. relief.