I have throat soreness or a warm burning from doing Lip Drills: so I stopped.
However, I am pleased to say that after many attempts and over a few weeks I can now do the lip drills and had difficultly at first like many have when starting out.
Yet there seem to be a sudden throat failure (_perhaps_) whenever I try to move up the scale. I constantly sing throughout the day as a habit and now finding it difficult to stop singing when I'm at the bus stop or elsewhere, lol. I have to literally force myself to stop singing to deal with this vocal tension. It appears that the voice is very slow in growth and or very sensitive (meaning doing a lip drill for a few times immediately requires long periods of rest for either muscle repair or strengthening).
One video suggested "yawning" as a warm-up.
Perhaps I need to monitor how much time I spend doing the lip drills such as 15 minutes, then when I recognize a slight growth in soreness or tension: stop for the day?
Do you know if the voice is like working out with weights where you need a day or two to heal?
It's a real slow start for singing and I have all the time in the world so I'm taking a course in Mixing Vocals which is pretty decent.
My goal is to slowly move into being able to have the endurance and strength to sing for a few hours a day.