Screaming fans and clanging cowbells have become the soundtrack to the New York City Marathon and to sporting events around the world.

© Graham Dickie for The New York Times

When the event’s five co-founders first proposed moving it out of Central Park, it seemed impossible. Much has changed in the sport and the city since that 1976 race.

© Paul Hosefros/The New York Times

Thousands of runners will take part in the New York City Marathon on Sunday. Temperatures are expected to be unusually warm for November.

© Johnny Milano for The New York Times

As the weight-loss drugs become more common, some runners find the side-effects challenging. Here’s what experts say

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Keri M, a marathoner in her 50s, knew the race would be terrible.

This feeling couldn’t be chalked up to inexperience. Keri, who asked us to omit her full name due to the sensitive subject matter, has completed dozens of half marathons and four full marathons.

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© Composite: The Guardian/Getty Images

© Composite: The Guardian/Getty Images

© Composite: The Guardian/Getty Images