The kettlebell or girya is a cast iron weight looking somewhat like a cannonball with a handle, used to perform ballistic exercises that combine cardiovascular, strength and flexibility training.Unlike traditional dumbbells, the kettlebell's center of mass is extended beyond the hand, similar to a clubbell. This allows for a wide variety of ballistic and swinging movements. By their nature, kettlebell exercises build strength and endurance, particularly in the lower back, legs, and shoulders, and increase grip strength. The basic movements, such as the swing, snatch, and the clean and jerk, engage the entire body at once, and in a way that mimics real world activities such as shoveling or farm work.
The movements used in kettlebell exercise can be dangerous to those who have back or shoulder problems, or a weak core.