It is impossible to draw gouache sketches, especially when they are synchronized. For example, you often paint and play tennis. I studied tennis in high school and learned to paint. The muscles of my left and right hands are obviously different, but I don't feel much because I am used to the strength of my arms. But if you don't draw after a few months of exercise, it's estimated that you have to get used to it for a while.

The students in the calligraphy department of Chinese painting department said that the pen was not smooth after sudden strenuous exercise, but that was because the arm was sore ~