On a rainy morning in April, Lisa Feuer took the subway to the Brooklyn Dojo, a martial-arts studio where she was scheduled to teach a mommy-baby yoga class. Outside, streams of water poured from awnings into the collars of passers-by. When she got to the studio, Feuer shook out her umbrella and picked out music from her iPhone to play for the class. But in the next 20 minutes, no one else showed up.
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