The best 24-hour fitness options in NYC

Boom Fitness has locations in Murray Hill and the Upper East Side, with the option of 24-hour service between Tuesdays and Thursdays. Budget-conscious gym bunnies should check out the Park Avenue location, as it's on the lower end of monthly fees ($20 per month).

Whether you’re a cardio-loving night owl or a weight-lifting early riser, you can enjoy working out inside a blessedly empty gym from 4 to 5am every weekday at The Rock Health and Fitness Club. Unlike the 24 Hour Fitness franchises scattered across the city, this all-hours gym boasts a rock-climbing wall, a dedicated room for CrossFit, a wet-steam sauna and a dry sauna—basically, enough to keep you busy until the sun rises.

Synergy Fitness Clubs have locations throughout NYC. Synergy offers free group fitness classes and flexible membership options, and the space has been recently upgraded to be more eco-friendly with self-powered cardio equipment and low-demand fluorescent lighting. Many of its gyms are open with 24-hour service between 6am Monday and 11pm Friday.