The pen is mightier than the sword, but that’s only because the pen spends three nights a week bench-pressing paper clips. Stay in tip-top sharp-object-dodging shape with today’s Groupon: for $20, you get five women’s kettlebell-kickboxing classes at Anderson's Martial Arts Academy (a $100 value). Anderson's Martial Arts Academy's online schedule lists class times and dates.

Anderson's Martial Arts Academy, featured on Good Morning America, coaxes muscles forth from their sub-epidermal hideouts with kettlebell-kickboxing classes that can increase agility, strength, endurance, and coordination for students of all fitness levels. The one-hour, female-only classes employ a kettlebell, a cast-iron weight that encourages ballistic and swinging motions, to sculpt the entire body into a Tolstoy-slinging machine. Anderson's muscle movers combine the non-impact kettlebell training with the fat-burning, tiger-like movements of Muay Thai martial arts in order to chisel and lengthen muscles. During each class, up to 30 bell-hurlers can potentially burn 600–1000 calories an hour, which is equivalent to approximately four Doritos sandwiches.

After each class, punchy pupils enjoy access to the sprawling 12,000-square-foot fight complex at Anderson's, complete with heavy bags, a mixed-martial-arts and boxing ring, and cardio equipment specifically selected to enhance martial-arts training. Participants have access to on-site shower facilities and should arrive dressed in comfortable clothes that allow freedom of movement, such as T-shirts, sweatpants, or Spider-Man footie pajamas.