A study in the Journal of Strength and Conditioning Research found that just six weeks of twice-weekly kettlebell swing training improves maximal and explosive strength by almost 10% and 20% respectively; equivalent to more traditional training methods.

For people living with functional or capacity limitations, kettlebells are a great alternative to other training methods which prove too challenging or impossible. For active individuals and athletes, kettlebells provide variety and a different neuro-motor stimulus for training and development.
Lake JP, Lauder MA. ‘Kettlebell swing training improves maximal and explosive strength’ J Strength Cond Res. 2012 Aug;26(8):2228-33