Ludlow Fitness

The New York branch of this small chain opened in 2006 and lets you work up a sweat round the clock. Classes in Spinning, yoga, Pilates, Zumba, boxing and other aerobic exercises start as early as 6:30am and run until 9pm, but free weights and top-notch cardio equipment—each equipped with a DirecTV monitor—are available at all times. Fees include all classes, towel service and a free apple on the way out the door.