Hi TP, thank you for posting that. When I was learning, my instructor took me thru the scenario in which the jab engine has failed, we're in a glide approach, and aren't quite going to make our designated landing spot because of an obstacle on short final, so a quick pull of the flaps lever to #2 gives maybe 20 ft, and hey presto, you're home OK. I still practice this (with imaginary obstacles!) but I've never needed it.
I avoid low flying like the plague: as I see it, there are two things that are your friend: airspeed and altitude.
Stay safe!