A strong man wrestles you to the ground to show off; a stronger man boosts your self-esteem and then accidentally breaks three of your ribs with a supportive hug. Learn the tenets of both strength and community with today's Groupon: for $97, you get one eight-week Body Challenge course (a $250 value) with full access to any fitness classes during that period at Seung-ni Fit Club. Choose either the Bay Road location (starting September 25) or Weiss Street location (starting September 18). Groupon customers must be registered before the start date.

Combining various fitness disciplines with solid nutritional counseling, Seung-ni Fit Club's trainers send bodies through a muscle-maintenance assembly line that leaves them trim and fit. Sweat sessions can include the fat-blasting Aerobic Kickboxing class, which sets self-defense, dance, and kickboxing techniques bouncing to a choice of upbeat contemporary music or mash-ups of 18th-century Scottish funeral dirges. Plyo Pump's high-intensity jumps and bounds condition bodies to explode with greater speed and power, and lean muscles surface with Body Sculpt's non-impact dumbbell workouts. Zumba sessions fuse energetic Latin dances with resistance training. Motivational instructors provide students with personalized nutrition programs and weight-loss tracking charts for settings goals and marking progress. Flexible schedules at both locations allow all challenge-accepters to get their muscles' worth in eight weeks, much like the two-month mail-order process for purchasing mussels from a shady internet sea captain.