Mike knew, though, that her neck muscles wouldn't hold out for long.

I saw his neck muscles tense and we were out of time.

He let me get behind him, but I saw the tension in his neck muscles.

Weak neck muscles that do not hold up the head well.

The answer is, you don't really lift the whole weight with your neck muscles.

So the closer you can get to the ground, the less force your neck muscles have to apply.

At the same time she could feel her neck muscles being strained.

His face was turned so sharply to the left that the neck muscles showed.

She swallowed hard; he could see the muscles of her neck working.

And looking up much puts a strain on the neck muscles, too.