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 $20, you get a one-month unlimited access membership to Crossroads Fitness (a $40 value).

Hidden behind an earthy brick-and-wood exterior, Crossroads Fitness shelters an array of constitution-fortifying contraptions and bright classrooms to aid members in their fitness-seeking pursuits. Eager iron-pumpers dive into flexing routines on the machines and barbells in the free-weight area, and a similar selection resides within the women's fitness center, kept private so gentlemen aren't embarrassed when out-dead-lifted by their grandmother. The socially fearless burn calories and build bridges in the weekly classes, ranging from basic yoga lessons to dynamic aerobic workouts. Group cycling sessions use the Matrix X-bike's rotating handlebars to mimic real racing situations, with some classes held outdoors to flesh out the athletic illusion. Bodypump programs repurpose weight-room exercises, such as squats, lifts, and curls, to strengthen the entire body in energetic 60-minute bursts.

A fireplace lounge greets visitors to the active arena with stacked stone and dark wooden beams that reflect the resort-like accents found throughout the facility. Locker rooms offer blow dryers, towels, and other complimentary toiletries, allowing visitors to pack light for their excursions and keeping parking lots free from sherpas setting up workout base camps. An in-house juice bar restores vigor with a variety of shakes or smoothies, and a fully staffed daycare area (complimentary for one child) assists parents tired of bench-pressing toddlers at home.