Kettlebell training develops strength, power, endurance and balance. Working out with kettlebells will sculpt and tone the entire body because lifting and controlling a kettlebell forces the entire body, and specifically the core, to contract as a group, building both strength and stability at the same time. They are a great option for getting a whole body workout in a short time. Made with a protective vinyl shell to prevent wear and tear. These kettlebells are cement filled and vinyl coated, providing a more economical choice over the tradtional cast iron made kettlebells.