Place both of your thumbs under your chin and the move them back toward the throat. Swallow and feel the muscles move. In this exercise you do not want those swallowing muscles to move. Continue holding your thumbs in place while singing the sound 'NA' as you move up and down the musical scale. Change the movement of the lips and mouth, as needed, to ensure you are not using the muscles in that area.
Use your tongue to roll an R sound through the octave scales, repeating as you increase in tone. Think about the positioning of your tongue as you roll and work on controlling it. This warm-up will help you avoid the dreaded lazy tongue sound while singing. Tongue position must be mastered to help create the proper inflection on the tones of the words being sung.
The feeling of resonance should be felt in the head, rather than in the chest. Replace all of the words in the song you are singing with the word MUM and sing from the head, not the chest. Refrain from changing the way MUM is pronounced. This exercise will help build resonance in the head and retrain the mouth to be the director of the song rather than attempting to belt out the tones from the diaphragm as it has been taught for many years.
Breath support is not stressed very much in speech level singing because it should come naturally. The idea is if you work on getting the bridges lined up properly and sung correctly through the head, the breath support will occur spontaneously. If you find you are gasping for air or trying too hard to control your breathing, relax and focus on singing more as if you were speaking and the breathing should begin to come instinctively.