A kettlebell is a solid cast-iron weight that looks similar to a large ball with a big "U-shaped" handle for easy grip. Kettlebells are used to perform core-strength exercises that combine cardiovascular, strength and flexibility training. Ideal for free-weight and cross-fit training, kettlebells are used in a variety of training exercises. The Aquila kettlebells are available in a range of weight sizes from 4 kg. to 24 kg. and are colour coded for easy recognition of the size. Simply choose the kettlebell weight suitable for you.