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 $89, you get to participate in the eight-week Body Challenge program at Seung-ni Fit Club, starting May 1 in East Lansing (a $250 value). The required two-month membership cost ($120) is included in this Groupon.

The eight-week Body Challenge is structured around three distinct parts: workout, nutrition, and accountability. In the workout portion, the Body Challenge combines aerobic kickboxing, body sculpt, and plyo pump into a flexible schedule. With aerobic kickboxing, participants kick the lock off their latent powers of self-defense, burning up to 800 calories an hour while jamming to sweat-inducing tunes. Body sculpt strengthens and defines muscles with resistance-training exercises that employ dumbbells, squats, presses, lifts, and curls. Plyo pump focuses on high-intensity circuit-training techniques and stretching to increase speed and build power. Throughout the eight-week course, participants follow a personalized nutrition plan created by knowledgeable and supportive trainers.

Accountability plays a role because participants are given a handbook, weighed once a week, and provided with a body-fat analysis to chart tangible progress. To reward successful students who lose the highest percentage of body fat, Seung-ni Fit Club offers cash and membership prizes. A recent first-place finisher won $300 in cash, a six-month membership, a one-hour massage, three cheeseburger scratch 'n' sniff stickers, $200 in supplements, $50 in Seung-ni clothing, and a trophy. All challengers on the winning team were also rewarded with a free month of membership.