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Welcome to Racked's Fitness Week: five days of workout coverage, so that you can start your New Year's resolutions off right.

Over the past few years, boutique fitness studios have undergone a mindblowing surge in popularity throughout New York City. Indoor cycling, CrossFit, and High Intensity Interval Training classes in particular have become so hot that it's hard to figure out where you should go to get your sweat on.

After the jump, we mapped out 12 fitness studios that are absolutely killing it: from kettlebell classes uptown to yoga in Williamsburg. We excluded the big-name, multi-location chains like SoulCycle, FlyWheel, Barry's, etc., because by now, you don't need a recommendation from us. Instead, we kept the list to smaller studios, most of which only have one location and have opened up within the past two years.