Adjusta-Bell "Mark I" Shell - Double ShellsAdjustable competition kettlebells are one of the best fitness implements to come around. Available from a variety of manufacturers, these weights allow anyone to work on their personal fitness with a compact, portable, and affordable system that will adapt to individual needs for years of training. About the only downside to these products is their minimum weight is usually about 12 kg (26. 2 lbs), which can be a challenge for those who are de