Can you tell a well-schooled sports instructor or a martial arts instructor from an unschooled one? Then watch the video in my latest article and point out the single teaching error that keeps a student practice a simple grappling throw for over ten minutes and still not get it–even though his instructor shows him the technique perfectly. The video is at https://www.stadion.com/a-bit-of-know-how-for-teaching-and-learning-techniques-faster/