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 $32, new clients get four Pilates Plus or Combo classes at Fitness Movement in Westlake Village (a $140 value).

Fitness Movement adds strength training and cardio to the core-building regimen of Pilates classes, helping clients melt fat and sculpt muscles at its spacious new studio. Each Pilates class runs 55 minutes, pausing briefly so students can sip water or tie their shoelaces around their index fingers to remind them to tie their shoelaces later. The Pilates Plus reformer class works the entire body, bolstering balance and toning troublesome areas such as thighs and abs. A combo of Pilates Plus and cycling adds 25 minutes of stationary biking to a 30-minute Pilates routine, inviting groups of 10 or fewer students to maneuver imaginary hills and paper routes. During the Core Barre combination, students execute ballet-barre exercises that tone flapping arms and lift glutes to the heavens. TRX combo workouts put body weight to use, creating exercises that increase strength and flexibility. Check out the schedule for current class days and times.