Boot camps apply military concepts to daily life, as do dance parties set to Morse code and tanks converted into school buses. Declassify your abs with today's Groupon: for $35, you get 10 sessions at Energy Boot Camp (a $165 value). This Groupon is valid for Energy's 6 a.m., 9 a.m., 2 p.m., 6 p.m., and 7 p.m. class times; preset booking to reserve a spot.

ACE-certified personal trainer Mike Worden funnels his passion for personal health promotion into each women's-only boot-camp session. Open to exercisers of all levels, classes require only that each student has a basic ability to perform exercise and to work one's growing biceps into everyday conversation. Corralling 12–20 campers for each 45-minute session, Mike slings an unpredictable routine of moves that may include squats, sprints, partner drills, kettlebell squats, push-ups, or sit-ups to boost both strength and endurance. Classes take place outdoors until November, at which point they convene indoors to avoid winter weather and its locomotion-jealous snowmen. For each class, students should don layered athletic apparel, and supply their own towel, exercise mat, and water bottle.