Her chest moved against his as if she were inhaling.

He was no longer breathing so rapidly; his chest moved slowly.

His chest doesn't move up and down when he sleeps.

As Sean's chest moved, she looked into the angry green eyes across from her.

His chest moved against her back with each breath he took.

The silence seemed to go on a long time, but the chest was still and would not move again.

The other man was so still that not even his chest moved with the process of breathing.

And he realized for the first time that her chest was no longer moving.

Then I realized, all of a sudden, that his chest wasn't moving.

She was staring, eyes fixed on her father, watching his chest move up and down.