Absolutely spot on Mr. Semel....the key to being a good instructor is being able to figure out what motivates your student. Some need just a kind word...some a sidewards look and a comment along the line of ..."well if that is as good as you can do....then ok!"....some need the fire extinguisher banged on their noggin. Find what gets them going...and teaching gets easy.
The same ol' drill does not work for every student....it takes some variation to get to them all.
If you teach on your "off" days....what do you do on your "good" days?
