He sat on the edge of a diagnostic bed, muscles knotted.

Muscles knotted at the edge of his jaw as he thought about it.

They were tense, all his muscles knotted with the effort not to cry.

There was cold pain in his left leg as though muscles were gradually knotting.

By the time he reached it, his muscles were knotting with cramps.

His muscles knotted with restrained need aching to be set free.

The man tried to roll away from her, his muscles knotted into cramps, and he lay still.

He was rigid, every muscle knotted, and sweat shone on his face.

Muscles knotted almost of their own accord and legs swung when they ought not to.

The muscles knotted and flowed as he moved, under his dark off worlder skin.