The Reebok 2.5kg kettlebell is excellent for increasing strength, endurance, agility & balance as it challenges both the muscular & cardio systems with dynamic total body movements. It is excellent for performing biceps curls or challenging shoulder muscles by making lateral or frontal movements. It can also be used as additional resistance when making crunches. The kettlebell challenges several supporting muscles at once providing a great advantage over dumbbells that work the muscles in an isolated manner.