The "fat but fit" debate has been raging for years now, and it's certainly far from over. That being said, a lot of research is in—and so far it says that overweight people can absolutely be healthier than thin people who don't exercise. That's not to say that everyone with extra fat who works out is in better shape than every lazy person who never hits the gym. Even setting aside the genetic factors that help determine our health status, there are plenty of people who don't work out but who are nevertheless in perfect shape. Just like there are fat people who have excellent health markers and don't end up with heart problems. Like so much else in the medical world, it's a spectrum.