Training with dumbbells provides a variety of advantages. Some of the advantages are practical and some are physiological, but without a doubt, dumbbells will be a good addition to your training program. One significant benefit of training with dumbbells is their relative low cost and adaptability in comparison with other modes of training. Most exercise machines are expensive and typically can be used to perform only one exercise. A relatively small number of dumbbells is required to train the entire body. For most people, a weight range from 5 pounds to 70 pounds in 5-pound increments will provide the resistance required to perform most exercises, although some advanced male athletes may need dumbbells 125 pounds or heavier. With this limited number of dumbbells it is possible to train all of the major muscle groups of the body performing only dumbbell exercises.