The Kettlebell or girya is a cast iron weight looking somewhat like a cannonball with a handle. Many companies produce their own brands of kettlebells and kettlebell exercise programs. Some modern kettlebells feature adjustable weights.
While today, there are sizes that range from 5lbs to 70lbs, the traditional Russian kettlebell is usually one which weighs 1 Pood (roughly 16kg / 35lbs).
Unlike traditional dumbbells, the kettlebell's center of mass is extended beyond the hand, similar to a Clubbell's. This allows for swing movements not possible with traditional dumbbells. Because more muscle groups are utilized in the swinging and movement of a kettlebell than during the lifting of dumbbells, a kettlebell workout is said to be more effective, and yields better results in less time.
Because the center of mass on a kettlebell "swings", micro-muscles are needed to balance a kettlebell, more so than a dumbbell. The existence of a handle allows for "release moves" which are not available to a dumbbell.
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