Kettlebells are cast iron weights ranging from 5 lbs to over 100 lbs, shaped like a ball with a handle for easy gripping. The kettlebell originated in Russia and was made popular in the U.S. because of how effective it is for performance training. Kettlebells offer a different kind of training using dynamic moves targeting almost every aspect of fitness—endurance, strength, balance, agility and cardio conditioning. People love it because it’s challenging, efficient and you only need one piece of equipment. Kettlebells are so effective because they stimulate the muscles and surpass standard cardio exercises. They enable you to increase your strength, build up speed as well as your endurance level at the same time.