I'm over 20 years old. Can I learn some martial arts? Is it useful?

You can learn martial arts at the age of 20, which is useful.

There are many kinds of martial arts, which tend to keep fit, but also pay attention to actual combat. At the age of 20, you can learn Sanda, which can not only exercise, but also achieve a certain self-defense effect. If you just learn routines, it is also very helpful to your health. Routine is to show your strength and speed through action.