The kettlebell is one of the most popular training tools for functional strength training. In this kettlebell set from Gorilla Sports, tradition and innovation come together. The weights are made of sturdy cast iron and have no weld seams, allowing them to withstand heavy loads during dynamic exercises like snatches and cleans. The clever feature is the soft cover, which protects the floor from scratches and dampens noise. The bottoms of the kettlebells are flat, preventing them from rolling away unintentionally.