kettlebells are one of the oldest and most basic types of exercise dating back thousands of years: however our design team have used the latest materials and innovation design features to bring them up to date. unlike dumbbells, kettlebells are intended to be used at speed. the design of a kettlebell means that the bulk of the weight is offset from the handle. when you swing or lift the kettlebell the inertia of the swing can make the weight feel 3-4 times heavier than it really is.tough and durable construction. moulded handle for body shaping. neoprene for extra durability.