Leahya Ellis and other spinning class participants use exercise as a way to shake away stress, anger and depression. Bastiaan Slabbers for NPR hide caption

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Peloton's New York City cycling studio has a television production facility so that subscribers, using bikes equipped with a waterproof tablet, can ride along at home. Issac James/Courtesy of Peloton Cycle hide caption

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A diagram released by the city of Paris shows how cyclists will be able to pass through intersections during red lights. In some cases, they can turn right; in others, they can go straight through. City of Paris hide caption

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Cyclists can now call AAA and other groups for help when they run into trouble during a ride. Here, cyclists ride near the White House in Washington, D.C., last autumn. Mladen Antonov/AFP/Getty Images hide caption

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A Wyoming man has won a Supreme Court case fighting efforts to route the Medicine Bow Rail Trail through his family's property. On this map, the trail is the unmarked route moving from the lower right toward Fox Park, where Marvin Brandt lives. Google Maps hide caption

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No more helmet hair: Hovding's "invisible" helmet is an air bag tucked away in a collar that gets fastened around a cyclist's neck. It's aimed at urban cyclists and priced at $535. Courtesy of Hovding hide caption

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Electric bikes made by French company Moustache are displayed during the Cycle Show 2013 in Paris last month. Charles Platiau/Reuters /Landov hide caption

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A mechanic repairs a bike at Calmera bike shop in Madrid in September. As car sales slump across Europe, bicycle sales in Spain are outpacing cars — a trend seen across much of the Continent. Pablo Blazquez Dominguez/Getty Images hide caption

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"So I got a ticket," bike commuter Molly Millar wrote in a tweet last week. The Vancouver cyclist had left her bike in a rack outside her office building. Molly Millar/Twitter hide caption

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In a photo taken on July 24, ELF bike owner Mark Stewart discusses the unusual vehicle during his trip from North Carolina to Massachusetts. Valerie Bonk/AP hide caption

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