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 $49, you get 10 Pilates mat classes at BodyMind Pilates, located on 28th Street (a $150 value). BodyMind Pilates breaks the mold of rigid routine with a modernized version of the classic core-strengthening fitness regime, adapting all current scholarship relating to how the body functions. Four mat classes are available for different levels or mixed levels, along with an advanced class that uses magic rings, rollers, weighted balls, thera-bands, and other props. With vivacious and compassionate instructors leading the way, Pilates pupils perpetuate harmonious equilibriums while campaigning in support of lean, long muscles and overall fitness, resulting in new careers as background dancers on televised cooking shows. Check out the schedule for mat class dates and times.