Like the framework of a mighty skyscraper, the core helps humans hold up the weight of the sky. Stay firm against the firmament with today's Groupon: for $30, you get five group Pilates classes at Deez Pilatez (a $150 value).

BASI Pilates–trained instructors engage the mind and body in Deez Pilatez's classes, which incorporate a wide variety of exercises on Balanced Body equipment and machines. Workouts on mats, Wunda chairs, and trapeze tables provide exciting exertion without the risks involved in bench-pressing a cheetah. Reformer machines work the body without putting unwanted stress on joints, and a variety of low-impact movements make the classes ideal for those recovering from minor injuries. Practicers of Pilates may experience improved circulation and the postural alignment necessary for competitive totem-pole impersonation. Inside the carpeted studio, a variety of machines, fitness balls, and colorful mats line the class area. Sketched Pilates forms hold positions on one side of the studio, and a wall of mirrors on the opposite side allow each student to keep a jealous eye on the perfect poise of their clone.