Barry's Bootcamp: 7 Barry's Bootcamp is based on interval training, which means you do a series of high-intensity workouts -- everything from sprints on a treadmill to squats -- with short breaks in between. While those brief breaks keep this class from reaching an eight or a nine on the sweat scale, it's still seriously sweat-inducing. (Plus, the trainers yell at you, which makes me sweat even when I'm doing nothing.)
Try it: There are locations in New York and California, as well as Nashville -- plus a few spots in Europe.
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