
After working with announcers for 39+ years, I can tell you a couple of tips that work; sit up straight (or stand up straight), anything else will only restrict your diaphragm. (This is particularly true of guitar players. They want to lean the upper part of their body forward to look at the fretboard.) Keep your head up too, looking down restricts your throat and air passage. (also hard to do for guitar players) We all have "lazy words" too. Those are words that we do not enunciate clearly when speaking and those same words will seem slightly slurred when trying to sing them. Work on those....a lot.
Most announcers that I have worked with have a lot of trouble with the word "regularly". It is even harder to pronounce correctly at the speaking tempo of most commercials. I have always told them when they see that word in a piece of commercial copy, just substitute the word "normally". lol
Bill