Ever feel scrutinized?
By a coach, a referee, the media?
Ever scrutinize yourself? Ever closely observe your every movement? Your every thought?
Great athletes observe and study their physical and mental actions. They become experts on their own physical and mental habits. They can then discern which are helpful and which are harmful. From there, the task is to cull out what is harmful to promote healthy, winning actions.
Yogis do much the same.
It's a path toward clarity. And a way to stay honest.