PARIS — In a windowless room in the Second Arrondissement of Paris, about 40 riders were clipped in and warming up, pedaling round and round, waiting for her to enter. When she did, she was wearing all black so that when she climbed onto her bike and stood tall on the pedals, she looked like a blond panther ready to pounce.
The class followed suit despite her not uttering a word. That’s because they all know Clotilde Chaumet, the 27-year-old spinning coach whose 45-minute classes book up as soon as they’re made available, a week in advance…