The little muscles at the hinges of her jaws bunched and trembled.

The muscles in her arms bunched and pushed, working well.

But I could see the muscles bunched under his shirt, the tension that he tried so hard to hide.

The four dogs were massive, the muscles bunched high in their shoulders above long, strong legs.

The muscles at the corners of his jaw bunched and released, chewing bitterness.

He gave her a couple of inches before his muscles bunched and his arm surged forward.

The rear muscles bunched and released as the creature became airborne.

I came to my feet with my muscles bunched, crouched in a fighting posture.

The great shining muscles of the horse bunched and shifted as he was driven forward.

The muscles at the corners of his jaw bunched and loosened.