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 $38, you get four drop-in mat classes at Pilates in Guelph (a $76.84 value, including HST). This Groupon is valid for classes running between Monday, August 29 and Thursday, October 6.

Pilates in Guelph's certified instructors woo the mat-curious with a lineup of 55-minute classes that blend styles and skill levels. Within a spacious, mirrored studio, groups of about 12 students acquaint themselves with the latest in advanced Pilates equipment such as trapeze tables and fitness circles designed to whittle muscles into toned renditions of interestingly shaped countries. Beginner-level classes, such as the Pilates Basics class, instill fundamentals; classes that target certain body areas, such as the intermediate-level Abs, Shoulders & Core class, employ weights and the participant's own body weight to strengthen the entire upper body. Intermediate-level students can glower in the face of the Pilates Bootcamp class, which zips students through high-intensity cardio movements and equipment work, leaving muscles grizzled and ready to punch in walls. Instructors cater to individual needs such as physical limitations and specific health conditions.