Cast Iron Kettlebells have been used by the Russians for centuries for strength and endurance training. You will often times hear them called Russian Kettlebells due to their origin there. Kettlebell training develops strength, power, endurance and balance. This is the reason kettlebell workouts have long been a favorite of throwers, jumpers, sprinters and hurdlers. You can perform squats, pulls, overhead throws and rotational training plus much more. The versatility and benefits of kettlebell training is the reason that athletes of all sports have turned to this training method today.