How to quickly judge whether a person is right-handed or left-handed?

It's very simple. As long as you compare which arm is muscular, which hand is thicker and which hand is stronger, the hand you often use must be better than the other.

It can also be judged from the leg shape that the supporting foot is generally straight and the auxiliary foot is relatively curved. If his left foot is straighter than his right foot, he is right-handed.