A recent research suggests that nearly a third of adults, 31%, are not getting enough exercise. That rates of exercise have declined is hardly a new discovery. Since the beginning of the industrial revolution, technology and economic growth have created a world in which exercise is more and more an option rather than a necessity. In all, the researchers were able to pool data from 122 countries, covering 89% of the world"s population. They considered sufficient physical activity to be 30 minutes of moderate exercise five days a week, or 20 minutes of intense exercise three days a week, or some combination of the two. Unsurprisingly, people in rich countries are less active than those in poor ones, and old people are less active than young ones. Less obviously, women tend to exercise less than men—34% are inactive, compared with 28% of men. But there are exceptions. The women of Finland and Iraq, for example, move more than their male countrymen.