Gag Reflex

From my “Teach Yourself Arabic” book:

“We have a muscle in our throat which is never used except in vomiting. Think about that and pretend that you are about to be sick. You will find that what is normally called in English gagging is actually a restriction in the deep part of the throat. If you begin to gag, and then immediately relax the muscles in order to release the airstream from the lungs, you will have produced a perfect : (called :ayn in Arabic). This sound must be distinguished from the glottal stop hamzah as the difference affects the meaning. For instance, :amal means work, but ’amal means hope.”

So essentially I have to try and make myself sick if I ever want to produce a perfect :ayn