Hey Reader, There’s been a lot of talk of “cold showers” recently. Maybe you’ve heard this. Super-pumped productivity whizzes on social media telling their legions of loyal followers how they: Get up every day at 5am Start with a freezing cold shower “Blast” an entire day’s work in 2 hours Go to the gym for 4 hours (only a slight exaggeration there) Eat a slab of red meat for breakfast Have everything done by noon and do nothing for the rest of the day You may think this sounds like fiction,...