 You feel like going to sleep. It's like, how in the world am I going to bed at 7.30? All I did all day was lay on the couch and watch sports. Well, that's why. You actually have to spend energy to make energy. And exercise, movement, motion, that's how you do that, right? And to put this into perspective and to put some science behind this, listen to this. If you're over 65 and you fracture your hip, you have a 30% chance of dying within 12 months.