Mike Coppola/Getty Bruce Springsteen Joins John Mellencamp for Surprise Performance of 'Pink Houses': 'My Good Friend' "You sing with your diaphragm. You know, my diaphragm was hurting so badly ...

we need to take deep breaths to help us sing through lines of lyrics. The muscle that helps us with this is called the diaphragm. The diaphragm supports our lungs as we breathe. If you place your ...