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 with them.

Thanks to a program funded by the great city of New York, I was able to take Zumba, cardio sculpt classes, and more for free when I was in my early 20s, long before I could afford a membership at a gym that offered such classes, let alone a certification course of my own. I still sign up for the occasional cardio class at the gym where I work, both to move my body and to indulge in the nostalgia, but I don't go as often as I could—because if I'm in the mood to dance around or do some HIIT, I can access guided workouts on YouTube for free.

Some of the channels offering these class

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