And he would fucking know. I have a chronic illness that made me bedridden for a week once. Eating caused me excruciating pain so I was unable to eat more than 300/400 calories a day, effectively starving myself over the course of several weeks. I was so weak that I couldn't run, and could barely walk. While I laid there in immense pain, I became furious at the thought that there were so many humans without debilitating diseases who were just choosing to treat their bodies like trash cans. They had the ability and energy to run yet didn't bother to because they took it for granted. I'm sure Hawking must feel similarly. I vowed to always exercise as soon as I got better, and I kept that promise.