
And female participants made up only eight to nine percent of the field in three big-city Spanish marathons. Worldwide statistics are hard to come by, but in Spain, for example, in 2013, women made up only 13 to 18 percent of the field in the country's three largest half-marathons (compared with 60 percent in the same distance in the United States).

While women's running has made big strides, especially in parts of Europe and South America, racing remains largely a men's sport globally. Outside of North America, however, the scene changes. Indeed, according to Running USA's State of the Sport report, 56 percent of all U.S. Stand among the throngs of runners at any race in the United States, and you'll be surrounded by women.
