Dumbbells are often sold in sets and are necessary for both standard exercises as well as muscle building. Dumbbells are used for almost every type of exercise and are an ideal tool for increasing the exercise difficulty. They can be used during running, stretching, strengthening and for burning fat. Dumbbells can be used at home or at the gym depending on the trainee. Many sets come with different types of weights that can be combined to form the perfect resistance. Dumbbells can be used for developing particular muscle groups such as pecks, biceps and triceps. Dumbbells can be purchased at an affordable price and can be assembled when required. Many individuals will often utilize dumbbells for simple stretching exercises as well as fat burning. weights