The first one I have issues with @AstroSky
I feel my skin stretching which is NOT good. I feel as this will stretch your skin and I feel as though the second exercise is a better alternative but I don't feel the stretch on on my neck muscles.. Are you opening your mouth wide. And what do you mean by putting your neck back as do it? Must you jut your jaw forward or chintuck while doing it? How long do you do it for. You leave out a lot of info.
When I open my mouth wide and do it My neck ligaments flare out and hurt. Same with the explosive mouth opens