The most secretive body parts are muscles, which hide behind layers of skin and appear only occasionally to help lift cars off trapped kittens. Flex your biceps in the absence of a cat emergency with today's Groupon: for $29, you get 29 days of unlimited use (a $133 value) at Fort Washington Fitness on Ft. Washington Road.

This expansive and elegant fitness facility boasts a well-rounded offering of equipment and group classes to ensure each and every part of your body is worked out equally. Zumba, Pilates, pole fitness, and cycling classes, among others, are taught in gleaming and spotless studio spaces, while the equipment rooms, packed full of high-quality workout apparatuses, buzz with human-powered energy. Your Groupon is good for 29 whole days of unlimited use of the facilities, so suit up for a month-long treadmill race against yourself on the specialized cardio equipment, ensure your biceps are bulging sufficiently for your upcoming cotillion by pumping iron in the machine and free-weight area, or drop into a dozen or so group sweat-sessions for new friends and tandem exercise encouragement. The gym also offers daycare and a junior fitness program for kids aged 8–12.

Fort Washington Fitness looks more like a Roman palazzo than a gym, decked out with polished floors, high ceilings, and a large water fountain in the lobby. Clean locker rooms provide private showers, saunas, and steam rooms, and the professional and engaging staff address you by your actual name, unlike the mysterious, cowl-clad trainers at that last gym who referred to you as "Number 6."

New members only.