Unknown to many, carnivorous extraterrestrials invented television as a fertilizing machine to ripen crops of delicious couch potatoes. Resist becoming a man-sized meal with today's Groupon: for $32, you get a five-class pass at Achieve Fitness on South Center Street (a $65 value).

Achieve Fitness's experienced instructors help clients realize their physical-fitness goals, combining encouraging and effective training methods with the comfort of a small-gym feel. Sculpt lean legs and bolster burgeoning biceps in any of Achieve's fitness classes, held throughout the week to accommodate clients' schedules. Take part in a flurry of calorie-burning with the Fitness Express class, where attendants quickly move from station to station under the guidance of a certified instructor. Strengthen and stretch stiff muscles with the balance-building Ball Blast class, or solidify arms and legs in the kickboxing class, an intense session that teaches pupils how to utilize furious foot slams to package shipping goods.