Although body-exchange programs mean no one ever has to stay in one meat suit for long, returning yours in bad condition means you forfeit your deposit. Keep your constitution in returnable condition with today's Groupon: for $19, you get a one-month membership to Bodytech Health & Fitness (up to a $50 value).

Bodytech Health & Fitness fine-tunes forms with a plethora of equipment and high-energy classes. Enjoy social sweating with unlimited access to group workouts such as Pilates, which stretches and strengthens bodies through an amalgamation of targeted exercises and focused breathing. Spinning burns fat and tones the lower body through a low-impact cycle ride set to tunes, and bootcamp serves up an ever-changing regimen of exercises such as kickboxing, jogging, and ab work.

Full access to the cardio theater sends carotid arteries into a tizzy, where row machines, steppers, and treadmills keep restless legs from roaming around abandoned missile silos. Target all major muscle groups on strength machines, or tone at your own pace using free weights. Pugilists can practice their punches on heavy bags, air bags, or water bags in the boxing area, and gloves, jump ropes, and medicine balls are available upon request for no additional fee.