Amen on "No Concept English." Terrible boring spoon-feeder books.
Thought of another one.
I won't teach without at least a ~5-minute break between classes.
A lot of the so-called training centers will try and put you into 3-4 hours of classes without any break at all, so they can maximize their profit, schedules, and utilization. They tried it at Web and we shouted 'em down...simply refused to play along until they finally backed down from it.
I just won't do this. I don't require an elaborate break, but I AM going to take 5 minutes or so between classes to smoke a cigarette, curse and grumble, and clear my head. Without this I become uncomfortable...and less effective. Once in a while a student will complain about this; I patiently explain that I am not a machine, can't go on for hours without a stop, and don't make the schedule.
If this doesn't satisfy them, they are welcome to bite me.