They represent an effectiveandsafer alternativethan traditional harddumbbells. In fact, ifduring exerciseoraHeavyball /Heavyblockhandlebarsaccidentallyhit apart of the bodythere would be noparticular risk oftrauma. Easilyusablewith bothhands or with your feet,can be filled withwater or sand tochange itsweight inaccordance with your needs.
