If your muscles are getting thicker, it means that your muscles have increased. But it is difficult for girls to gain muscle, so don't worry too much. Girls can secrete very few hormones. Therefore, there will be no phenomenon that muscles are getting thicker and thicker.

Expansion: Do three groups of dumbbell exercises, each group lifting 20-30. You can rest for about a minute in the middle, so that you won't let your arms grow muscles. If you start practicing, you can lift ten at a time, and then gradually increase after getting used to it. If you persist in this way, you can play the role of slimming your arms.