YG Studios

This newish studio in the Flatiron District gives fitness instructors a no-frills space where they can offer new classes and build up clientele. One instructor who’s gaining a big following here is Courtney Paul, a Barry’s Bootcamp alum, with his CPXperience. The 50-minute high-energy strength-training and cardio–boot-camp class mixes up moves that focus on a different body part each day: Mondays are all about the back and biceps, Friday is chest day. One thing you can always count on in each session is ab work (the road to a six-pack, unfortunately, involves many, many crunches). Paul keeps class sizes small so you can expect the kind of attention you’d normally find in a personal-training session. Translation: It’s hard to slack off. $28/class.