Hello, practicing dumbbells is a way to exercise arm muscles, and it also has a certain fitness effect on other parts of the body. If you are not a teenager and over 20 years old, it doesn't matter to you. If you are still developing, don't be less exposed to this kind of sports. In fact, you can exercise or grow taller by taking part in ball games, such as basketball. As for dumbbells, you can also get rid of them, but you'd better not spend too much time on them.