If you are very very very skilled at those pitches, meaning ...you do it, and you can lecture people. You don't go and stepping on the boy's brain, they got blame enough. In other words you teaching them per skill.

A real thing they carry in their life. With a better wish whatever they going with it.

Per pitch, per melody, per rythem, per sounding, per in between. You do it precisely enough. So you teach them by ear, and make sure they really pick up that. If you can deliver that, don't blame on them, I am sure you can collect a bunch of them, whomever required to get their drum, or what calculation things in between the interval sound right for their right hand, left hand, to hit it which surface of the sounding material? Their chest?

You have to know how to teach - Instructional.

How to say it right words, how to demonstrate per interval?  

You passing it by with a roll of paper, you roll it on the left arm, and start hitting your hands together. This is how you do it. Got it? They usually in the music studio cage room, or one of those ballet you seeing people's room at.