Push vs pull teaching
The Gracie family has a series of videos called Gracie Bullyproof that's designed to teach young kids ju-jitsu. As a father of two young kids who are fast approaching school age, I'm seriously getting a hold of these.
The video below is a sample from the introduction that teaches the parents how to teach their little kids. Frankly, I think this little segment alone is really, really good advice on teaching anyone, young or old.