What are the benefits of action description?

Action description is one of the important methods to depict characters. Every action of a character is restricted by his thoughts and personality. Therefore, a detailed description of a character's reaction in a certain situation-mainly action reaction-will inevitably show his inner activities, attitudes and ideological qualities. Successful action description can explain the identity and status of the characters, reflect their psychological activities, show their personality characteristics, and sometimes promote the development of the plot.