Two-thirds of Americans get no exercise at all. If one of those people gets up and moves around for 20 minutes, they are going to get a huge number of health benefits, and everything beyond that 20 minutes is, to some degree, gravy.

That doesn’t mean I’m suggesting people should not exercise more if they want to. You can always do more. But the science shows that if you just do anything, even stand in place 20 minutes, you will be healthier.

If you are overweight but fit, meaning you have a reasonably good V012 max (a measure of oxygen uptake), then your risk of premature death, all the chronic diseases — diabetes, heart disease, cancer — will drop. If you have to choose, choose to be fit, whether you lose weight or not.

If someone starts an exercise program and improves his fitness, even if he doesn’t lose an ounce, he will generally have a longer life and a much healthier life. It would be nice if people would look at exercise as a way to make themselves feel better and live longer and not necessarily as a way to make themselves skinnier.

One of the biggest misconceptions is that exercise has to be hard, that exercise means marathon running or riding your bike for three hours or doing something really strenuous. That’s untrue and, I think, discourages a lot of people from exercising. If you walk, your body registers that as motion, and you get all sorts of physiological changes that result in better health. Gardening counts as exercise. What would be nice would be for people to identify with the whole idea of moving more as opposed to quote ‘exercise.’