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:
What did the trainer most likely sat to Areya?
Explanation:
It depends how long you do it because if you were to doing plank, it can be a choice for you to know when to stop.
