Weight Maven Beth Mazur found evidence in favor of the fewer days, at least in post-menopausal women.
I don’t like to exercise. Sometimes I find excuses to avoid even my twice weekly 40-minute workouts. I do enjoy hiking; I even hiked to the bottom of the Grand Canyon and back out last May. But that’s not exercise, it’s more recreation.
You may well have good reasons to exercise every day. Maybe you’re a competitive athlete or enjoy exercise. If you just want the health benefits of exercise, I’m increasingly convinced that twice a week is enough.