A kettlebell is a cast-iron or steel weight that resembles a cannonball with a handle. It is used for strength training, conditioning, and flexibility exercises. Kettlebells come in various weights, allowing users to choose the appropriate level for their fitness goals. They are popular in both individual workouts and group fitness classes. Kettlebell training involves dynamic movements that engage multiple muscle groups, promoting functional strength and endurance. Common exercises include swings, snatches, and Turkish get-ups. This versatile equipment can be used at home, in gyms, or outdoors, making it accessible for a wide range of fitness enthusiasts.