The Body Smart Dumbbells are versatile and easy-to-use weights that will help to tone arms and upper body muscles, and are perfect for home use. Dumbbells can be used for weight training as well as full-body fitness. Using dumbbells can be a great way to workout at home or at the gym. There are many different exercises you can do - and the weight can be easily adjusted to meet your needs. Dumbbells are especially effective - because as well as working the main muscles - they also require numerous stabilizing muscles to help out.