Personal fitness, like pyramid building, involves patience, perspiration, and the ability to outsmart heavy blocks of butterscotch. Lay the foundation for a firm physique with today's Groupon: for $129, you get to participate in four weeks of unlimited Train Like Jane classes at Corefitness Chicago (up to a $300 value).

Corefitness Chicago's Train Like Jane classes help females burn fat and fortify core muscles through primal-movement techniques in a fully equipped facility. Seasoned workout wizards lead a flexible weekly schedule of classes, which are limited to 20 students to grant each pupil personalized instruction. During the one-hour sweat sessions, participants tone muscles with methodical exercises such as squats, lunges, and farmer walks, building upper-body strength by lugging weights and optional shoulder parrots. Trudge diligently with sandbags and kettlebells, or plow forth with a Prowler sled, designed to work thighs and hips like the syncopated musical stylings of Shakira.