Like a tree house, a gym never lets nonmembers inside and always deflects frogs fired from the neighborhood bully’s slingshot. Hurry up the rope ladder with today's Groupon: for $75, you get a three-month membership to Girlfriends Fit Club in Holland (a $150 value). Memberships must be activated within a month of purchase.

Girlfriends Fit Club brings ladies seeking healthier lifestyles together, combining an encouraging environment with chic amenities and plentiful equipment. The club welcomes new members warmly with a gift bag, orientation session, and body analysis, which is used to personalize three workouts. Unlimited group classes allow members to party their way to toned bods with Zumba's Latin beats, reach deeper poses during yoga sessions, or sample the club's step, kickboxing, and other body-bettering classes. A cardio theater brings entertainment to exercise machinists with TVs and finger-puppet stagings of Tamburlaine, and weight-training equipment sculpts muscles and strengthens frames.

After workouts, members retire to the boutique-style locker room, with lavender walls and lockers, stylishly upholstered chairs, and a full-length dressing-room-style mirror. For an additional fee, Friends Club childcare entertains tots under the supervision of a caretaker.