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With walls outfitted in army camo and red disco lights, this Los Angeless–based boot camp class seems suited for the David Barton-gym-as-nightclub-set. The 60-minute classes ($32 each) combine cardio and strength training, with participants divided into two groups, going back and forth between doing interval running on treadmills (or shredding, as it’s called here), and floor work, often using dumbbells. In addition to the large, mirrored studio, which can hold up to 40 participants, the 3,500-square-foot space touts a juice bar, lockers, and frills-free changing rooms equipped with showers. — Randi Eichenbaum

There is a sense of team camaraderie here, with instructors acting more like coaches than drill sergeants.

Cons
Classes can be large, resulting in a lack of personal attention, and adjustments during the floor work portions can be minimal.