Kettlebell workouts engage multiple muscle groups at once, kettlebell workouts train your strength and conditioning at the same time. Hollow Core-constructed from single cast without fillers. This creates better Balance as most competition bells with welded bottom and filler can shift and rattle making it hard to complete workout. No Welding-This unfilled competition kettlebell is made by precision single casting technology, which means it is cast as one solid piece instead of welding parts. Color Coded-Each individual weight is colored coded to a specific color for easy identification and international competition standards made for kettlebell sport. Lifetime warranty & free workouts- We publish workouts, techniques and how to's you can access them with your purchase designed to enhance your workout experience. Uniform size-Regardless of weight, so you don’t have to continuously adjust your lifting technique as you move up in weight.Using a dual cast process, two moulds are used to create the competition kettlebell leaving it hollow in the middle. This make for an unbeatable balance as well as never having the dreaded “kettle rattle” you can get in bells that have scrap metal welded inside that can come loose after many drops. Excellent for full body workouts, exercises involving kettle bells focus on working the various muscle groups at the same time. While dumbbells are just commonly used for regular isolation exercises, such as curls and lateral raises.