I discovered spin classes a decade ago, and subsequently got certified to teach them myself. In the years since, I haven't focused on other kinds of cardio group classes—but for a time, I was obsessed ...

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Carrie Gardner, the trainer who taught the class, is a dynamo. I'm accustomed to working hard, fast, and long. She, however, almost literally didn't stop, for an entire hour. We may have paused a few ...

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