Dumbbells can certainly exercise the arm muscles. The way to exercise your arms is usually to use dumbbell exercises, such as you can do training with your palms up, holding dumbbells in your hands, bending forward, you can also do training with your palms inward and upward, you can also lift sideways, you can also lie flat after dumbbells are placed on both sides of your head, bend your elbow joints palms to your back, then straighten your elbow joints to lift dumbbells backwards, and also lift dumbbells upward after standing position. Each action can be done the same number of times, when doing these actions, should be measured to muscle joint fatigue is not appropriate.