Humanity’s hunter-gatherer forbearers spent a great deal of time exercising in order to successfully combat the packs of carnivorous treadmills that roamed the primordial plains. Honor your ancestors with today’s Groupon: for $20, you get a one-month membership package at Planet Fitness (up to a $93.16 total value). The membership package includes:

• The membership intiation fee (a $59 value).
• The first-month’s membership fee (a $10 value).
• The prorated initial annual fee (up to a $24.16 value).
• Unlimited fitness training.<p>

Choose from the following locations: Addison, Chicago, Evergreen Park, Melrose Park, and Naperville.

Planet Fitness provides a judgment-free zone where guests of all ages and fitness levels can take advantage of myriad aerobic and strength-training options, as well as the club’s friendly, down-to-earth atmosphere. Patrons may chisel, strengthen, and balloon muscles by pushing and pulling the extensive selection of brand-name equipment and free weights, or, with the help of a trained instructor, design a custom workout program based on exercise history, medical background, and goals of completing an underwater bicycle race. Thirty-minute small-group classes concentrate on strengthening and toning specific body parts, and others promote salubrious bodies by presenting full-body circuit workouts designed to give each and every lackadaisical muscle a Popeye-like infusion of metaphorical spinach. Though membership automatically cancels after the first month, Groupon customers may opt to continue a month-to-month membership by paying the monthly fee ($10).