A 'Trend' is a large social influence if this is what you are talking about. Trends are something where one person does/wears it (usually a popular person everyone likes) and then everyone else starts doing it.
Answer:
It is impotent to behave in PE class because misbehaving will also lead to distraction in many ways. If someone is being disruptive in PE class it was distract the whole class and most likely put the whole class behind.
