i am trying to teach someone singing but they usually cant control not gliding from below into the note, i havent been able to figure out the right advice to help them control it. Do you have any advice to be able to control it as opposed doing that kind of pitchbend approach from below at specific moments  naturally. Happens more when trying to work on songs that they've been singing it that way for years.
the question i would ask is, do they want to stop doing it, or is this something you want them to do