“You live in a world where you can drive through the drive-thru, flop down in a chair to work all day, and spend your evening on the couch, in front of the TV, before you crawl off to your cozy bed. Even if you work hard all day, your day-to-day living can make your body soft. And that softness is a modern-day killer, the equivalent of the savanna-dweller’s lion (actually, the lion was better, since it kept people moving).”