The kettlebell is a cast iron weight used to perform ballistic exercises that combine cardiovascular, strength, explosive power, and flexibility training.

Sizes may range from 4 pounds (1.8 kg) to 175 pounds (79 kg).

Unlike traditional dumbbells, the kettlebell's center of mass is extended beyond the hand. This necessitates ballistic and swinging movements. Typically,  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, engages the entire body in a multiplanar activity.

The movements used in kettlebell exercise can be dangerous to those who have back, shoulder problems, or a weak core. Kettlebells are for advanced lifters with proper muscle balance.