Eight-Week Weight-Loss Challenge or Three Months of Unlimited Fitness Classes at F.A.S.T.E.R. (Up to 72% Off)

Losing weight takes conscious effort, just like remembering to blink frequently enough to keep other people from getting suspicious. Fit in with this Groupon.

Choose Between Two Options

• $99 for enrollment in the eight-week Skinny Jeans Challenge (a $349 value)
• $149 for three months of unlimited fitness classes (a $447 value)

A meeting on January 12 kicks off the Skinny Jeans Challenge, covering the rules, expectations, and the contents of the program's playbook. Participants hang up a pair of their current jeans and pose for a "before" picture. Over the following eight weeks, they attend as many fitness classes as they'd like while filling out the nutrition-journal portion of their playbook. They’ll discuss these journals during weekly meetings, which take place at 8 p.m. on Wednesdays or 8 a.m. on Saturdays. During these meetings, coaches will answer questions and measure each person's progress. At the end of the program, members try on their old jeans and snap "after" photographs.

Instructors lead two types of fitness lessons: Group X Fitness, a high-intensity cross-training class, and Bodiography, a mix of Pilates, yoga, and strength-building exercises. Click here for a class schedule.