Skipping today’s workout won’t kill you. But routinely skipping exercise the rest of your life will likely make your life shorter than it could be. If that little alarm bell doesn’t nudge you to start taking walks, let us remind you of that eye-opening JAMA study by Cleveland Clinic Foundation researchers that made headlines back in 2018: It declared that poor aerobic fitness is a far bigger risk factor for premature death than either smoking or high blood pressure. That’s why it’s essential to focus on these ugly side effects of not working out and to get your body moving.