The spectators all cringed. It was as if they had fallen themselves and were able to feel the pain of the fallen athlete. According to the biological basis of observational learning, the action of ___ might underpin the spectator’s behavior.

Mirror neurons

Explanation:

Mirror neurons are the neurons that tends to responds when they perform a particular action and when they observe any certain action. These neurons work through observing and imitating through expression, emotions and feelings.

According to the question, spectator's behavior can be depicted through action of mirror neurons which is producing expression through observing the fall action that produced pain in athlete.This pain is analyzed by observers through observational learning.

it´s related to his charming character.

beauty is not everything, although we can joke that girls only care about the physical or material aspect, the truth is that a real woman looks at more important things, besides intelligence and personality, there are other attitudes that make irresistible to men who are 'unattractive'.

for example develop your sense of humor.