EQUINOX
Number of locations: 13
www.equinoxnyc.com

Even though it keeps rolling out new locations, Equinox’s expansion hasn’t taken attention away from the existing locations (the two oldest spots, 19th and Broadway and 63rd and Lexington, are even getting some much-needed refreshing). That means there’s an Equinox convenient to just about every neighborhood, and the company’s commitment to debuting new classes and new methods like Fre Flo Do (martial arts done while walking on a treadmill) keeps workouts from getting boring. The best reason of all to join: the 25-yard three-lane pool in the Time Warner Center.