If you’re like many people who work out regularly, you may be looking for a way to spice up your existing training regimen and kettlebells may be just the thing. Kettlebells are cast iron weights that range in weight from five pounds to some that are over one hundred pounds. Kettlebells were first used in Russia and have become more popular in the United States within the last few years. One of the primary reasons that kettlebells have grown in popularity is due to the many different types of exercises that can be performed using them. Kettlebells offer an individual the ability to target almost every aspect of fitness from endurance, strength, balance, cardio and agility.