Based on the assumption that novice trainers, including kids, don’t know how to squat. The logical course of action for the professional coach is to provide visual inputs for them to copy. Demo, demo, demo.
But what if that assumption was wrong? What if the “expert” didn’t know what they didn’t know? What if what they were paying attention to was irrelevant? And what was missing was important?
When you work with unknown unknowns the best way forward is to experiment. What happens when you move faster, or slower, put your arms in the air, and so on?
“Isn’t that interesting” might be a better response than I told you so?