Exercising with friends allows you to morally support each other, and, when the time comes, to have the collective muscle to beat up an asteroid headed for Earth. Get strength in numbers with this Groupon.

Choose Between Two Options

• $39 for one week of unlimited boot camp (a $150 value)
• $99 for three weeks of unlimited boot camp (a $275 value)

Click here for an online schedule of classes. This deal is valid at the Battery Park and Washington Square Park locations only.

[[m:####Stacy's Bootcamp

Stacy draws from more than 17 years experience in outdoor fitness training when leading her classes atop the pavement and under the trees of New York City parks. Using a background in tae kwon do, capoeira, kickboxing, and boot-camp drills, Stacy creates high-intensity routines that combine cardio and strength exercises that can be adjusted for various fitness levels. She forgoes fancy machines and instead uses the environment, sculpting strong arms with 15-pound weights brought in by clients or wiping sweat from the brow with a nearby leaf.

Stacy doesn’t just stay active through boot-camp instruction: She also leads an active lifestyle speaking at workshops and corporate events. Furthermore, she contributes articles to the Huffington Post, leads retreats, and teaches fitness while traveling to international locales, such as India.