Mirror is controlled through an app, Mirror Fitness, that allows you to search for classes, track your progress, review workouts, browse through curated radio stations, and sync any Bluetooth devices. Eight certified personal trainers, like former New York City Ballet dancer Katie Bergstrom and former Division I athlete Chris Ryan, bring you up to 65 new live classes per week, filmed in a special black box room at the Mirror's production studio (with no clients, of course). There are boxing, barre, strength, cardio, pre- and postnatal, yoga, stretch, and Pilates workouts, ranging from levels one through four and 15 minutes to an hour long.
During these live classes, a trainer will see a panel of clients up on a screen, Kailee Combs, Mirror's VP of fitness content, told POPSUGAR. "Throughout your class, you can send notes and emoji onto the screen, and those basically go straight to the trainer, so a lot of times you'll hear the trainers say, 'OK, that was a hard one guys; give me an emoji, tell me how you're feeling,'" she explained. Once these classes finish up, they're added to an on-demand library so you can access them any time.
Mirror comes with a heart rate monitor, and data from this monitor (or your own device) personalizes your workouts. "Mirror tells you if you're working out in the appropriate heart rate zone," Kailee said. You also fill out an intake survey when you first set up the app, "where you tell Mirror how often you want to work out, what you like to do, and if you have any injuries, so it personalizes Mirror classes for you based on that data, too." For instance, if you have a knee injury during a HIIT class, Mirror will automatically give you alternative low-impact moves. You'll get class recommendations each week on the app homepage as well, which change over time as your data changes.