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 is naturally impervious to bullets instead with today's Groupon: for $29, you get two Pilates and two hoop-dance classes from Fusion Movement (a $60 value).

Drawing from three different health and fitness certifications and a degree in movement science, Susan B. Stack guides small-group classes in Pilates workouts and aerobic hoop-dance classes. One-hour Pilates classes build up sturdy cores with a holistic take on exercise that combines concentrated breathing and flowing motion. Gentle workouts protect the body by maintaining a neutral alignment of the spine while engaging the abdomen to sculpt stomachs into Michelangelo's David. Clients shatter beads of sweat due to cardio-respiratory exertion in hula-hoop-dancing classes that improve balance, coordination, and motor skills. The simple motion of twirling a plastic ring around the waist builds muscles in the entire body and can transport students back in time to their childhood without the risk of wedgies or changing the future. Group dance classes are typically held at Celebration Belly Dance & Yoga Studio, and Stack limits classes to about eight to ten students to make sure each participant gets individual instruction.