By Phil Wagner, M.D. For the Daily News Posted: 12/01/2009 10:46:36 PM PST Updated: 12/01/2009 10:46:37 PM PST As the fitness fad of stability balls fades, the excitement over Kettlebells has encouraged many coaches, trainers and athletes to pursue this new endeavor in search of the Holy Grail. The Kettlebell is a weight consisting of…