A CAP Barbell Dumbbell is classed as a Weights piece. Weights include any type of exercise implement, such as dumbbells, barbells, plates, and bars that are used during calisthenic or weight-lifting exercises, are not structurally attached to anything else, and are user controlled. Every muscle in the body can be worked out with weights, by either pushing, pulling, raising, lowering, or simply holding a free weight.