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 $49, you get 10 mat Pilates or cardio classes at Pilates 1901 (a $200 value). This Groupon is valid for Cardio Kettlebells, Mat Challenge, Mat Essentials, Step, and Cardio Dance classes.

Trained in Stott Pilates techniques, the 12 instructors at Pilates 1901 employ a more modern repertoire of movements that emphasizes restoring natural posture and enhancing athleticism. During the mat Pilates classes, a trainer takes small groups of students under their lean wings as they flow through several stability and stretching postures. Meanwhile, cardio classes scheduled throughout the week motivate students to shape up by sweating off calories in a variety of exercises. In addition to sculpting long, tight muscles, mat work and cardio can also help clients prevent injuries, burn through excess weight, and build a sturdy core to avoid being swept up by a tornado and dropped on a hapless witch.

Pilates 1901's fitness facility boasts multiple studios equipped with various exercise tools, ranging from standard mats and kettlebells to stair climbers, stationary bikes, and flaming punching bags. After customers have used their Groupon's 10 sweat sessions, they have the option of getting an additional discount on Pilates 1901's Equipment Pilates package, which includes six private sessions (a $259 value; $210 for Groupon-holding customers).