You can exercise with dumbbells. Although many people say that this will produce muscles, it can actually achieve the effect of thin arms. Hold the smallest dumbbell with both hands, lift it from the side to the shoulder level at the same time, do a group of 20 times, and then lift it from the side to the ear, also do a group of 20 times. Finally, practice lifting dumbbells with one hand for 20 times. Keep practicing every day, 1 month will have a slight effect, and then you can increase it according to the actual situation! You can choose to do several groups according to your specific situation and corresponding physical strength, but be careful not to do them continuously. It can be done at different times of the day. It really works. I have done it myself.