I am just getting over a bout with the flu.
In recovery mode now and I need to get rid of some thick gobs of phlegm in my respiratory tract.
Trying to cough it up while sitting up or standing takes effort and hard coughing can result in inflamation.
It is so much easier to make gravity work with us than against us....so try these techniques that will make the process of clearing out the crap so much easier.
An ironing board can be propped up at one end and used, or else firm couch cushions work great.
I think 15 minutes of this "therapy" daily is much better than none but some people in really bad shape might require numerous sessions daily.