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Welcome back to Pursuits Weekly, our look at the big culture stories of the week, as well as ideas and recommendations around travel, dining, art, luxury and living. Sign up here to get it every Saturday in your inbox. On Sunday, New York hosts the world’s biggest marathon, with more than a million spectators cheering on some 50,000 runners, including Pursuits’ own Halie Chavez. That doesn’t mean it’s fun! As Nick Thompson writes in his new book, excerpted last week, long-distance running is often extremely painful. And, even though it’s ostensibly one of the cheapest and most democratic sports, it can be very expensive, too. More on that in a bit. But first we have to go to the toilet.