Iron Fitness's name and garage-like exterior might suggest that it holds a cavernous space full of musclemen and barbells. Instead, step through the doors and you'll find an intimate, boutique workout experience marked by 9,000 square feet of fitness machines and three studios with distinct identities.

Iron x PT specializes in personal training. During one-on-one fitness sessions, upbeat but tough-minded trainers analyze what clients need to do to reach their fitness goals, then motivate them to do it. Momentum, on the other hand, is all about the power of group fitness. Its instructors don't just follow workout trends—often, they set them, pioneering styles such as the hip-hop-based Groov3 and Pound, which celebrates percussive rhythms and prepares students for marathon meat-tenderizing sessions. Finally, the Elite studio connects gloved fists and with punching bags in a ring run by pro-level boxing instructors.