In the Victorian era, people made their cores look tight by wearing corsets, which doubled as bulletproof vests during pistol duels. Strengthen your core until it's naturally impervious to bullets instead with today's Groupon for classes or personal training at Gold Coast Pilates in Setauket.

• For $48, you get four Pilates Reformer classes (up to a $96 value).
• For $39, you get four Pilates mat classes (an $80 value).
• For $49, you get two 30-minute personal training sessions (a $100 value).

Gold Coast Pilates is a fully equipped Pilates fitness studio that hosts community events, special workshops, and instructor education authorized by Balanced Body University. During one-on-one sessions, a certified trainer can build a personalized program for clients with back pain or sport orders, or introduce newbies to pliancy-promoting Pilates apparatus such as the spine-correcting Arc, the trunk-training Reformer, or the soul-supporting Dementor. Participants can also engage in communal core-crunching with a group Reformer class, and those who prefer to keep their stretching simple can attend the mat classes, which are held on Monday evenings and utilize props such as balls, bands, rollers, and the Pilates ring. Click here to view the full class schedule.

Though Gold Coast Pilates sometimes features a discounted price online in January for the Reformer classes, this Groupon still offers the best deal available.