Like potbellied pigs, kettlebells contain neither cookware nor bells and can only be lifted by the world's strongest people. Become Herculean with this Groupon. Choose Between Two Options $65 for twenty kettlebell classes (a $400 value) $39 for ten kettlebell classes(a $200 value) Certified instructors lead students through full-body, multijoint, and core-based movements with kettlebellsâ€”cannonball-like weights with handles on top. The fluidity of these motions forces the muscles to work in concert throughout the body, simultaneously building strength in the core, thighs, shoulders, and arms. See the schedules for class times at each of the locations.