Kettlebell weighing 16 kg. Kettlebells are ideal functional training equipment for boxing and gyms where strength training, cardio or guided activities are combined. They are ideal for increasing the variety of free weight exercises, such as the kettlebell swing, thrusters, and thus working on muscle strength in a functional way. Kettlebells are a training tool that helps us develop strength, endurance and balance. But in addition to being used for strength training, kettlebells are perfect for cardio routines due to the extra movement needed to perform some exercises. They are made of cast steel with a vinyl coating, which increases their durability and safety for both the user and the environment. The handle is ridged for a better grip and is wide enough to work comfortably, making it perfect for heavy use in strength training.