We all know that fitness is fabulous. It makes you look and feel better. Now we know that it also helps you to live longer. Fitness trumped every other factor tested in a new AHA comparison of fitness, weight loss and reduced body index (BMI) and length of life. So what about weight loss and reduced BMI? What affect do they have? This answer will surprise you. Here’s more from Cleveland Clinic cardiologist David Frid, MD.