While feeling the burn during a workout is generally a good sign, feeling the burn while sitting on the sofa means your sofa is in the fireplace. Engage in controlled, constructive body burning with today’s Groupon, valid at Endurance Fitness Center in Monroe, Metro Family Fitness in Clinton Township and Mt. Clemens, and Viking Fitness Center in Marine City, Marysville, and Port Huron. Choose from the following options:

• For $34, you get three months of unlimited fitness equipment use (up to a $129 value).
• For $39, you get three months of unlimited fitness classes (up to a $149 value). Group classes are offered at Endurance Fitness, Metro Family Fitness, and Viking Fitness’s Marysville location.
• For $45, you get three months of unlimited equipment use and unlimited fitness classes (up to a $179 value).
  
  

The ACE-certified instructors at Endurance Fitness, Metro Family Fitness, and Viking Fitness help clients overhaul their health with up-to-date fitness equipment and a lineup of motivating group fitness classes. Build endurance and test out newly added extra limbs by completing circuits on cardiovascular and weight-resistance training machines available at all locations. Exercisers pump body pistons on a cadre of treadmills and elliptical trainers or heft towers of weights pilled atop Nautilus and Body Masters pin selectors. Some gym locations distract athletes from nagging muscles with cardio entertainment stations, where suspended flat-screen TVs cheer them on with their favorite shows and repeat broadcasts of the Coach opening sequence.

Members with access to group classes dance to Latin beats in Zumba, work out kinetic energy in recumbent bike spinning sessions, and sucker-punch calories in Cardio Kickboxing. Instructors conduct sweat sessions in separate classrooms, where members match rhythm with energetic radio tunes atop supportive foam or hardwood floors, while water-inclined students can dip into Metro Family Fitness’s indoor pool for aqua fitness classes or high-octane bouts of Marco Polo. Class offerings vary by gym, so be sure to check each location’s schedule.