Through extensive studies, scientists have found that sweat is created when the brain’s motor center sends special signals to skin cells that cause them to think about the movie Rocky VII. Create an action movie in your epidermis with today's Groupon: for $29, you get five group workout classes at CoreFitness (a $75 value). Classes available with this deal include boot camp, circuit training, Zumba, and cardio kickboxing.

Instead of being held in a traditional gym, CoreFitness peppers class locations throughout the Philadelphia area, making it easy for swamped suit-wearers and pressed parents to find a workout that fits snugly into their schedules. Each of the innovative and varied workouts is offered both indoors and outdoors to let members contemplate the cityscape or take cover from Mother Nature's spite. Terpsichorean twirlers can savor the exciting dance routines of Zumba, with a fusion of Latin and international music that makes for a dynamic and captivating exercise routine. Boot camps and circuit training make sweat glands celebrate with full-body workouts that promote strength and increased energy. Check the class listings for updated information before the first class.