Like tug-of-war tournaments and harmonized singing telegrams, workouts are more effective when done with a group. Join a fitness community with this Groupon from MetaBody: for $49, you get unlimited outdoor boot-camp sessions for women through 9/30/12 (a $450 value).

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The inspiring trainers at MetaBody lead groups of workouteers in results-oriented workouts several times weekly. During boot-camp classes, instructors weave interval and strength training into traditional callisthenic and body-weight exercises to produce full-body results in a supportive environment, ideal for beginners and hard-core core hardeners alike. By exploiting humanity's instinctual distrust of routine, trainers keep tendons on their toes with new and challenging moves as well as the occasional heart-pumping round of “What’s My Line.” In addition to the fitness classes, students receive a success guide to help prepare for imminent pound loss, a nutrition guide, and a $100 gift certificate for individual coaching from MetaBody’s team of certified nutritionists.