We had been told on numerous occasions that using a cough assist machine on a regular basis would be beneficial to Evan's health. It is an amazing machine and fortunately for us Evan thinks it is "funny" to use.
Something that we have found to work well when he doesn't want to use it is for us (the parents) to use it. Along with the pediatric mask the hospital gave us an adult mask. Evan and I take turns using it and I know that that alone keeps the machine "fun" as opposed to a task he has to do.