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 $50, you get 10 Xtend Pilates classes (a $250 value) at Core Integrity Pilates in Greensboro.

Core Integrity's warm, spacious Pilates studio provides ample space to engage in the Xtend barre workout, a fusion class that sculpts the body through a blend of Pilates and ballet. Each 55-minute class loosens, strengthens, and lengthens the body through a technique called muscle mixing, which targets every major muscle group with lights weights, a ballet barre, and intense core-strengthening abdominal exercises. Classes are limited to 20 students, ensuring a fun and effective workout with plenty of individual attention from one of two dedicated instructors.