Since the rise of the Internet, people have struggled to tear their now-useless phone books in half. Bulk up to succeed where others have failed with today’s Groupon: for $29, you get a one-month membership (a $59 value), including access to all group classes, one personal-training session (a $50 value), and a fitness analysis (a $50 value) at Club 51 Fitness in Centerville (a $159 total value). Registration fees are waived for Groupon customers.

Members at Club 51 Fitness can buff their bodies with personal-training sessions, a variety of fitness equipment, or more than 20 group exercise classes each week in its 30,000-square-foot gym space. During the one-month membership period, exercisers can sweat solo on treadmills and ellipticals or wield free weights to build muscle and prepare for their next piano-hefting competition. Women can work out their muscle kinks on cardio and strength-training equipment in the private women's area, and members of all seven genders can sculpt their bodies and condition their muscles in group classes.

Workout wizards perform a one-hour fitness analysis to calibrate each client’s body mass index before introducing them to the gym’s exercise equipment with a brief tutorial. Then, during a one-hour personal training session, trainers will customize a workout plan according to each client’s personal fitness goals and advice from sentient medicine balls.