Whether you run 30 minutes a week or two hours a week, your risk of early death will be the same — better than if you don't run. Researchers found that running, no matter the duration or speed, will reduce mortality risk by about 30% compared with non-runners.If the point of the study was that there is a point of diminishing returns, and it is fairly low (thirty minutes a week of running, or any other vigorous exercise, as the article later explains, gives you all the benefit of two hours a week), then it would be nice to know what that point of diminishing returns is. Read literally, a person who runs three minutes a week gets all the cardiologic health benefits of running thirty minutes a week. Sorry, but that is quite counterintuitive.
Still: even a bit of exercise is better than none. In my case, I keep doing forty minutes a night on the treadmill because it helps me sleep, reduces my appetite, and lowers my blood pressure.
My cardiologist has reduced my blood pressure dosages in half because my blood pressure was too low. Typically, my morning blood pressure is about 113/70, and my pulse is typically 60-66.