Kettlebells are one of the most versatile pieces of fitness equipment available. This functional fitness tool can be used for strength training, HIIT, cardio and mobility. The SUMO Strength Cast Iron Kettlebells increase in size as they increase in weight, allowing more kettlebells to fit into certain spaces. Ranging from 8kg to 32kg, The SUMO Strength Cast Iron Kettlebells are a perfect addition to any home gym or commercial facility.