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 beginner or experienced Pilates mat classes at SweatShop Health Club, located in St. Paul (a $170 value).

At SweatShop Health Club, Stott Pilates–trained experts ease exercisers into higher states of fitness with a bevy of props, hands-on instruction, and plenty of friendly support. Participants in a low-impact mat Pilates class focus on neutral spinal and pelvic alignment and how this pertains to core stability, building strength and flexibility while sweatily acquainting themselves with equipment such as bands, foam rollers, weighted balls, and wrecking balls. Classes are scheduled for both beginning and advanced students and meet up to three times per week. Pilates parents can offload their progeny into the safe, on-site childcare facilities every weekday for a small fee ($4 a visit).