A lot of gyms are one big industrial space loaded with machinery and harsh lighting, but Crunch has so much personality! Crunch SoHo is my favorite. Each of the four floors has a different purpose: Cardio, Weights, Studios, Boxing/More Cardio. You could take the little elevator in between them, or keep your heart rate up by taking the stairs. It's cute and comfortable, and since the equipment is separated by floor, it's easy to find what you're looking for. Plus you don't feel like you're on display!
Pros: not crowded, convenient location, fun!