Dumbbells are commonly used for adding additional weight to the body when the difficulty of a particular exercise has to be increased. Dumbbells can be purchased for a relatively small price. The dumbbell sets provide more room for movement and therefore can be used to target muscle groups that barbells and other heavy weights cannot. Dumbbells can be placed on certain areas of the body to isolate and work particular muscles such as the biceps and glutes. They can be carried when running or walking to improve fat burning. They can be used to target abs and six packs as well while using the dumbbells at the bench. Dumbbells are ideally used with cardiovascular workouts to increase the intensity and efficiency. Weights