Is it useful to practice writing on the wall?

Is it useful to practice writing on the wall? Practicing calligraphy on the wall is not only useful, but also beneficial. As we all know, practicing calligraphy first refers to the harmony between the strength and qi of the wrist and arm. These, practicing calligraphy on the wall can be exercised at the same time, just like practicing calligraphy on the plane. But I have to say that practicing calligraphy on the wall will improve the grasp of arm strength, waist strength and internal qi, thus ensuring the stability of holding the pen. Therefore, practicing calligraphy on the wall is more beneficial than practicing calligraphy on the plane. Of course, it will be more difficult to practice calligraphy on the wall than on the plane.