If you place your thumb under your jaw then move it back to the soft bit just behind it, this is the underside of your tongue, gently press your thumb in here. Now take in a silent breath, it should stay soft or go a little softer, now slide up and down through your range on any vowel that is comfortable for you. It is very common for students to feel that as they slide higher that the tongue starts to
push against the thumb, this is a sign that root tongue tension is starting to kick in. If this goes unchecked then the throat will lock up.
1. Slowly stick your tongue out then bring it back it; do this several times.
2. Say the word "glug" a lot as this will work the front and back of the tongue.