HIT Fitness slam balls have been rigorously tested and designed for withstanding high intensity ...throwing exercises. HIT Fitness weighted slam balls come equipped with a hard textured shell which protects the slam ball itself and the surface at which it is thrown.Slam balls can be used for resistance training exercises such as bulgarian split squats and weighted sit ups. However, slam balls are predominantly used for dynamic exercises such as overhead slams and side throw slams. Ball slams are full body movements which recruit a massive amount of muscle fibers at once. Thus slam ball workouts are perfect for those looking to save on time and get a quick hiit workout in.